Welcome to the North American Subaru Impreza Owners Club Sunday July 13, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Subaru Models > Impreza Forum

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 04-22-2012, 01:14 AM   #476
2012 polish STI
Scooby Newbie
 
Member#: 317635
Join Date: Apr 2012
Chapter/Region: SCIC
Vehicle:
2012 WRX STI
Dark gray

Default

I bought the Cobb state 2 kit intake downpipe and exhaust and remapped my ecu so I can say I got better mpg
* Registered users of the site do not see these ads.
2012 polish STI is offline   Reply With Quote
Old 04-22-2012, 01:17 AM   #477
flyboy1100
Scooby Specialist
 
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:
2012 2.0i Sport 5MT
DGM

Default

Quote:
Originally Posted by 2012 polish STI View Post
I bought the Cobb state 2 kit intake downpipe and exhaust and remapped my ecu so I can say I got better mpg
but not on a 2.0i Impreza
flyboy1100 is offline   Reply With Quote
Old 04-22-2012, 01:17 AM   #478
ST Eye
Scooby Specialist
 
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:
2008 STI Boost Wagon
2014 Honda Accord Hybrid

Default

Quote:
Originally Posted by 2012 polish STI View Post
I bought the Cobb state 2 kit intake downpipe and exhaust and remapped my ecu so I can say I got better mpg
I also have a stage 2 setup in my STI and I can say that I'm getting worse gas mileage.
ST Eye is offline   Reply With Quote
Old 04-22-2012, 01:25 AM   #479
2012 polish STI
Scooby Newbie
 
Member#: 317635
Join Date: Apr 2012
Chapter/Region: SCIC
Vehicle:
2012 WRX STI
Dark gray

Default

I drive 70mph on the freeway and get great mpg but I'm also using 100 octane so I dont know what to say
2012 polish STI is offline   Reply With Quote
Old 04-22-2012, 01:30 AM   #480
SleepNMnky
Scooby Specialist
 
Member#: 302491
Join Date: Nov 2011
Chapter/Region: Tri-State
Location: Buffalo, NY
Vehicle:
2012 Impreza 2.0i Pr
Dark Grey Metallic CVT

Default

Quote:
Originally Posted by 2012 polish STI
I drive 70mph on the freeway and get great mpg but I'm also using 100 octane so I dont know what to say
You can start by saying it somewhere else. This is a 2.0i Impreza forum.
SleepNMnky is offline   Reply With Quote
Old 04-22-2012, 09:43 AM   #481
79letour
Scooby Specialist
 
Member#: 302570
Join Date: Nov 2011
Location: dear old dixie
Vehicle:
2013 XV
DGM!

Default

Did some high speed mpg testing in the country last night.
It only gets 5 mpg at 130mph... Lol
I went down two bars on the fuel gauge in just 4 miles of fun twisty dirt road. Definitely kills mpgs when you start to get on it at all..
79letour is offline   Reply With Quote
Old 04-22-2012, 09:47 AM   #482
auskip07
Scooby Specialist
 
Member#: 315643
Join Date: Apr 2012
Chapter/Region: South East
Location: Atlanta Ga
Vehicle:
2012 Impreza Sedan
DGM 5mt

Default

My first tank got me 25 mpg. Which i thought wasnt bad for all the stop and go traffic i was in for that week.
auskip07 is offline   Reply With Quote
Old 04-22-2012, 05:27 PM   #483
thom52
Scooby Newbie
 
Member#: 309257
Join Date: Feb 2012
Chapter/Region: NWIC
Location: Kirkland WA
Vehicle:
2012 Imp 5D Prem CVT
Marine Blue

Unhappy Long distance freeway driver car

Remember folks, the dash gage reads optimistically. I am finding, as others are that its a pretty wide variance of 1.5 to a bit over 2 mpg optimistic.

So I filled up my wife's CVT hatch Premium 16" stock tires Impreza for a long freeway drive over the Pass to eastern WA yesterday.
She had driven all city/suburbia driving on the tank.
21.6 mpg dash gage
18.7 mpg calculated
Chevron 87 octane gas. Kirkland Police pretty much kill any opportunity to drive it hard in the city. Weather has been balmy and we have over 1000 miles on the car.

120 mile Trip over TO eastern WA was basically a roll downhill onto the freeway, ALL freeway, with some of that a "highway" that varied from 45-50mph with no traffic. One stop light on the entire trip. Freeway was 65-70mph with a lot of drafting. Instant MPH gage indicated drafting at the 70mph speed limit was more efficient than floundering along alone at 60mph. I babied the accelerator.
approx 31 mpg on the way over.
TOTAL mileage round trip was coaxed up to 34.5mpg, literally coasting most of the last couple blocks home from the freeway to my house. It was pushing 80 degrees ambient on the way home.
(a AWD car designed only for warm climates????)

Gotta say, if it wasn't for the resale hit(as discussed ad nauseum already), we would dump this otherwise fine car on the basis of its lousy TRUE City gas mileage, and gotten a Prius, which is was our plan before Subaru dangled 27mpg city in front of us.
I find it fascinating that many people seem perfectly happy, with a mix of mostly freeway mileage, getting mpg that barely surpasses the city claim.

I have noticed several people have broken through the 10k miles mark, which is the latest number Subura is tossing out for "mileage break-in" to put off the many complaints. I have NOT seen those people jumping up and down for joy with vastly improved gas mileage numbers happening miraculously at that mileage. Of course people hitting that mileage this soon, are already in the sweet spot for this car's design, with long freeway commutes.

I would say I am NOT impressed by Subaru's entry into the "high mileage" market. It just doesn't take that much good design to create a one trick pony that sacrifices short haul and city driving to ONLY get good freeway mileage on long drives, especially with a small 2 liter engine.

This car is not topping CITY mileage of the 2000 Accord that it replaced, or even surpassing my AWD Element(in city), that is half again as heavy and has a much bigger engine.

The Impreza is a great car for long freeway commutes/drives (although I now would say the Premium standard seats are awful for long drive comfort) but for good city gas mileage ...stay away, or be willing to accept gas mileage not above 20mpg CALCULATED.
YMMV
thom52 is offline   Reply With Quote
Old 04-22-2012, 06:04 PM   #484
nubsub
Scooby Specialist
 
Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:
2012 Impreza 2.0i HB

Default

i need to do some GPS comparison, but i've taken 3 separate trips recently and compared my odometer with Googlemaps and found that the odometer is likely off 2-3%, in that it underestimates the distance. this doesn't quite make up for the 5% overoptimistic computer for mileage, but it does cut that difference a little (this is the Limited with 17" wheels which i think comes it at about 0.7% bigger circumference than the 16" wheels if i recall correctly)

i think stop and go is hard on any car, and as you Thom suggests, maybe worse for the impreza.

i think to achieve EPA 27 mpg city, the city driving has to be suburban style like i encounter and the person can't be doing too many <4 mi trips where the car starts off cold. for my driving and living in the mild climate of CA, i am seeing similar mixed driving mileage (maybe 1-2 mpg less...don't have enough data to firm this up) as i was in my honda civic (2000, which was rated 27/32mpg accounting the 2008+ EPA standards).

my car is still very new (at 700 miles now) but i can deduce that once the car is warmed up, the EPA estimates are pretty reasonable. i don't know if things will better a lot after i put on a few thousand. but if it gets 1-2 mpg better on both ends of the spectrum, i'll be satisfied.

Quote:
Originally Posted by thom52 View Post
Remember folks, the dash gage reads optimistically. I am finding, as others are that its a pretty wide variance of 1.5 to a bit over 2 mpg optimistic.

So I filled up my wife's CVT hatch Premium 16" stock tires Impreza for a long freeway drive over the Pass to eastern WA yesterday.
She had driven all city/suburbia driving on the tank.
21.6 mpg dash gage
18.7 mpg calculated
Chevron 87 octane gas. Kirkland Police pretty much kill any opportunity to drive it hard in the city. Weather has been balmy and we have over 1000 miles on the car.

120 mile Trip over TO eastern WA was basically a roll downhill onto the freeway, ALL freeway, with some of that a "highway" that varied from 45-50mph with no traffic. One stop light on the entire trip. Freeway was 65-70mph with a lot of drafting. Instant MPH gage indicated drafting at the 70mph speed limit was more efficient than floundering along alone at 60mph. I babied the accelerator.
approx 31 mpg on the way over.
TOTAL mileage round trip was coaxed up to 34.5mpg, literally coasting most of the last couple blocks home from the freeway to my house. It was pushing 80 degrees ambient on the way home.
(a AWD car designed only for warm climates????)

Gotta say, if it wasn't for the resale hit(as discussed ad nauseum already), we would dump this otherwise fine car on the basis of its lousy TRUE City gas mileage, and gotten a Prius, which is was our plan before Subaru dangled 27mpg city in front of us.
I find it fascinating that many people seem perfectly happy, with a mix of mostly freeway mileage, getting mpg that barely surpasses the city claim.

I have noticed several people have broken through the 10k miles mark, which is the latest number Subura is tossing out for "mileage break-in" to put off the many complaints. I have NOT seen those people jumping up and down for joy with vastly improved gas mileage numbers happening miraculously at that mileage. Of course people hitting that mileage this soon, are already in the sweet spot for this car's design, with long freeway commutes.

I would say I am NOT impressed by Subaru's entry into the "high mileage" market. It just doesn't take that much good design to create a one trick pony that sacrifices short haul and city driving to ONLY get good freeway mileage on long drives, especially with a small 2 liter engine.

This car is not topping CITY mileage of the 2000 Accord that it replaced, or even surpassing my AWD Element(in city), that is half again as heavy and has a much bigger engine.

The Impreza is a great car for long freeway commutes/drives (although I now would say the Premium standard seats are awful for long drive comfort) but for good city gas mileage ...stay away, or be willing to accept gas mileage not above 20mpg CALCULATED.
YMMV
nubsub is offline   Reply With Quote
Old 04-22-2012, 06:42 PM   #485
Tjohns
Scooby Newbie
 
Member#: 314510
Join Date: Mar 2012
Chapter/Region: NESIC
Location: Maine
Vehicle:
2012 Impreza2.0i 5D
Red Pearl

Default mpg

Quote:
Originally Posted by thom52 View Post
be willing to accept gas mileage not above 20mpg CALCULATED.
YMMV
I'm satisfied with the mileage. The EPA estimate is 30 combined. I have about 1200 miles on the clock and my last 2 fill ups both hand calculated to 31.8.

I drive about 300 miles per week. 1/3 are highway (70-75mph) and the rest are mostly back roads that are moderately hilly (35-50 mph). Of course the computer reads high 32's to low 33"s for average mileage which is mildly irritating. I try to drive with mileage in mind, drafting when practical, using downhills to accelerate and decelerating on uphills etc.
Tjohns is offline   Reply With Quote
Old 04-22-2012, 09:09 PM   #486
SubyDoWhreRU
Scooby Newbie
 
Member#: 308063
Join Date: Jan 2012
Default

Sport premium 5-speed here with 3k miles on the odo. 100% of the gas I've used has been Shell 97 [edit: 91] octane ethanol-free (other than whatever the dealership put in the first tank).

I with a 5 mile one way trip to work that is about 50% 55mph and 50% 35mph with 4 lights I get an average of about 25.5-27 on each tank hand calculated. The dash usually reads about 27.x mpg.

I take trips home to my parents house every couple of weeks about 60 miles away on a 55mph road (I drive about 60-62) for about 55 of those miles. Those tanks have averaged 29.5 (with 120 miles being highway and the rest of the miles being my work commute). I don't drive with a light-foot at ALL. I enjoy the hell out of this car even if it costs me a couple of MPH. Once my dash read 28mpg and i calculated 29.9 (I triple checked this because this is the only time my calculated has been higher than the dash)
My highway mpg according to the dash is usually around 34-38. I've never had an entire tank highway other than the one I'm about to explain so I haven't been able to calculate it manually.

Last week I had to go to another town for an all day event for work that started at 7am about 70 miles away. I've noticed my mpg gauge thingy tends to peak at about 42-45 mph in 5th gear. so I left early and filled my tank up. I had no traffic to worry about since it was so early so I set my cruise control at 43ish and left it in 5th gear wish is about 1700 rpms. Did the same thing on the way home. 142.8 miles on the trip. I filled up 3.552 gallons. 40.2 mpg. Dash read 41.8. Now I realize this is a very impractical test and only one very small sample size, but It does show the numbers aren't a complete lie.

edit: It was 91 octane, not 97... not sure why I thought it was so high.

Last edited by SubyDoWhreRU; 04-23-2012 at 04:26 PM.
SubyDoWhreRU is offline   Reply With Quote
Old 04-22-2012, 11:16 PM   #487
pxpaulx
Scooby Newbie
 
Member#: 306218
Join Date: Jan 2012
Chapter/Region: MWSOC
Location: Twin Cities, MN
Vehicle:
2012 Impreza CVT
DarK Grey Met. Sport Prem

Default

Quote:
Originally Posted by SubyDoWhreRU View Post
Sport premium 5-speed here with 3k miles on the odo. 100% of the gas I've used has been Shell 97 octane ethanol-free (other than whatever the dealership put in the first tank).

I with a 5 mile one way trip to work that is about 50% 55mph and 50% 35mph with 4 lights I get an average of about 25.5-27 on each tank hand calculated. The dash usually reads about 27.x mpg.
How much more does that 97 no ethanol blend cost you? Based on the MPG returns it doesn't sound like it is worth the extra cost. Have you tried running 2-3 tanks with plain old regular to see if it worth the additional $ being spent?

I'm going to be trying a station near me that has 90 grade ethanol free - have run this tank down to 2 bars (pretty good tank, dash says 33.9, likely around 32 calculated, just dropped the 3rd bar at 350 miles). I'm going to give it at least 2 tanks to see if it is worth the $0.20 cents extra/gallon (will need to net 5% MPG gain, or 1.5mpg at 30mph average...I don't think it will, but we shall see).

@Thom, sorry your car isn't improving, seems as though many others are - I didn't see real improvement until around 3K miles. It ran better even in some recent cold weather (30s-40s), temps it was giving me around 28 in Jan and Feb were now returning 4mpg better. I'm still dissatisfied with the start-up sequence of this car - it seems that regardless of air temp it wants to run a terrible engine start-up sequence that makes the cvt run very high revs for a good 3-5 minutes (and/or 3-5 miles) of driving. Even though I've been maintaining between 32-33mpg, without fail every cold start (regardless of outside temp) it'll drop about 2/3 from the mpg reading which I have to make up over the rest of my commute. That is my only complaint. If your subaru is regularly driven cold for less then 3-4 miles, I could imagine where your poor numbers are coming from.

Last edited by pxpaulx; 04-22-2012 at 11:25 PM.
pxpaulx is offline   Reply With Quote
Old 04-23-2012, 01:19 AM   #488
nubsub
Scooby Specialist
 
Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:
2012 Impreza 2.0i HB

Default

Quote:
Originally Posted by pxpaulx

...

Even though I've been maintaining between 32-33mpg, without fail every cold start (regardless of outside temp) it'll drop about 2/3 from the mpg reading which I have to make up over the rest of my commute. That is my only complaint. If your subaru is regularly driven cold for less then 3-4 miles, I could imagine where your poor numbers are coming from.
Not sure if my revs are that high when cold, but even in our warm morning here yesterday(over 80 oF) it took about 2-3 mi for the Eco gauge to start showing reasonable mileage and stop my ave from plummeting. My four mile runs to the train station are killing my mileage even in warm CA. I am guessing those runs are in the 22 mpg range.

Last edited by nubsub; 04-23-2012 at 02:10 AM.
nubsub is offline   Reply With Quote
Old 04-23-2012, 01:27 AM   #489
ST Eye
Scooby Specialist
 
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:
2008 STI Boost Wagon
2014 Honda Accord Hybrid

Default

Quote:
Originally Posted by nubsub View Post
Not sure if my revs are that high when cold, but even in our warm morning here yesterday(over 80 oF) it took about 2-3 mi for the Eco gauge to start showing reasonable mileage and stop my ave from plummeting. My four mile runs to the train station are killing my weather even in warm CA. I am guessing those runs are in the 22 mpg range.
I think you'll find this common with a lot of vehicles, not just the Impreza. I'm not sure if it has to do with the car's ECU being in open loop when first started.
ST Eye is offline   Reply With Quote
Old 04-23-2012, 02:11 AM   #490
nubsub
Scooby Specialist
 
Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:
2012 Impreza 2.0i HB

Default

Quote:
Originally Posted by ST Eye
I think you'll find this common with a lot of vehicles, not just the Impreza. I'm not sure if it has to do with the car's ECU being in open loop when first started.
I think if it's common, it's a bit longer for the impreza vs other cars. My wife's Prius gets poor mileage for just about a mile. No more than 2 and it's doing it's high mileage thing.
nubsub is offline   Reply With Quote
Old 04-23-2012, 10:07 AM   #491
ocellaris
Scooby Specialist
 
Member#: 302559
Join Date: Nov 2011
Default

Quote:
Originally Posted by thom52 View Post
TOTAL mileage round trip was coaxed up to 34.5mpg, literally coasting most of the last couple blocks home from the freeway to my house. It was pushing 80 degrees ambient on the way home.
(a AWD car designed only for warm climates????)

Gotta say, if it wasn't for the resale hit(as discussed ad nauseum already), we would dump this otherwise fine car on the basis of its lousy TRUE City gas mileage, and gotten a Prius, which is was our plan before Subaru dangled 27mpg city in front of us.
I find it fascinating that many people seem perfectly happy, with a mix of mostly freeway mileage, getting mpg that barely surpasses the city claim.

I have noticed several people have broken through the 10k miles mark, which is the latest number Subura is tossing out for "mileage break-in" to put off the many complaints. I have NOT seen those people jumping up and down for joy with vastly improved gas mileage numbers happening miraculously at that mileage. Of course people hitting that mileage this soon, are already in the sweet spot for this car's design, with long freeway commutes.
I also find it odd that some people are really happy with their real world MPG even though they aren't getting close to the window sticker. The logic seems to be "It was better than my last car"

I can't break 36 MPG even when I am doing nothing but driving on the highway and trying to baby the gas as much as possible. My last car was rated 30 MPG highway and I could get close to 35 MPG actual with normal highway driving.

Anyway if you stick with the "long freeway commutes", the problem is that you normally aren't doing those in terrible weather, and you can get far better MPG with something like a Civic or similar MPG with a larger more powerful car from various companies. Also if you get up on the gas, the Impreza has a very steep falloff over 65 MPH, and other cars do not.
ocellaris is offline   Reply With Quote
Old 04-23-2012, 10:33 AM   #492
Oceanguy
Scooby Newbie
 
Member#: 310466
Join Date: Feb 2012
Location: Douglassville, PA
Vehicle:
2012 Impreza
Camellia Red Pearl 5spd

Default

We just re-fueled after trying a full tank of ethanol free fuel. Cost was about $.20 higher per gallon so at 14 gallons = $2.80 additional cost versus the lower priced 10% ethanol fuel. The MFD showed the same average MPHs at 34 MPH average and we got a 2 MPG bump (30.8 versus 28.8 prior tank). I re-fueled with 10% ethanol and will see if it drops again. I think I will switch to the Ethanol free whenever possible... Also - hit 3,400 miles and the oil was a quart low. Pep Boys has a rebate on Valvoline SynPower $15 back on 5 quarts ($35 - $15 = $20 for 5 Quarts) so I picked them up for top-offs. The car does almost no idling so I am very disappointed in losing a quart during this short of time. I may register for the 300,000 mile warranty with Valvoline... I recommend to all to check the oil level when re-fueling.

Last edited by Oceanguy; 04-23-2012 at 10:42 AM.
Oceanguy is offline   Reply With Quote
Old 04-23-2012, 10:37 AM   #493
SubyDoWhreRU
Scooby Newbie
 
Member#: 308063
Join Date: Jan 2012
Default

If you bought the impreza only for it's MPG, then of course you're not happy! That's like buying a prius because toyota claims its the fastest hybrid, then complaining about its 10 second 0-60 time and top speed of 90. (Yes these numbers are pulled out of my ass but that isn't the point)

I bought an impreza because of the AWD, and the Boxer, and the awesome styling, and the trusted reliability, and the resale value, and the fact that I've had my car for 3 months and haven't seen a single other one in my city (i like being unique), and for its MPG as the only car that gives me everything else I wanted, the mpg is just a plus. I still would have bought this impreza if it still had last years 27 highway 2.5 EJ engine.
SubyDoWhreRU is offline   Reply With Quote
Old 04-23-2012, 10:45 AM   #494
flyboy1100
Scooby Specialist
 
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:
2012 2.0i Sport 5MT
DGM

Default

Quote:
Originally Posted by SubyDoWhreRU View Post

I bought an impreza because of the AWD, and the Boxer, and the awesome styling, and the trusted reliability, and the resale value, and the fact that I've had my car for 3 months and haven't seen a single other one in my city (i like being unique), and for its MPG as the only car that gives me everything else I wanted, the mpg is just a plus. I still would have bought this impreza if it still had last years 27 highway 2.5 EJ engine.
while I agree with almost everything you posted, the only thing that made me switch from Mazda3 to the Impreza was the new engine and better MPG than the old 2.5. I always wanted a Subaru, and in the winter on my normal 82miles/day commute it will be nice because it does take a few days to get the roads cleared. so I didn't buy 100% for mileage but it was a large factor. as long as i can average 30, I will be happy because that is 7 (25%) better than my current car, and on par with our Jetta
flyboy1100 is offline   Reply With Quote
Old 04-23-2012, 10:46 AM   #495
SubyDoWhreRU
Scooby Newbie
 
Member#: 308063
Join Date: Jan 2012
Default

Quote:
Originally Posted by pxpaulx View Post
How much more does that 97 no ethanol blend cost you? Based on the MPG returns it doesn't sound like it is worth the extra cost. Have you tried running 2-3 tanks with plain old regular to see if it worth the additional $ being spent?
I don't necessarily buy it for the MPG boost but for the fact that it protects the engine better and keeps it cleaner and ethanol is TERRIBLE for engines. If you go longer than 7 days between fill ups about 10-30% of that ethanol is evaporated and water has taken its place. After 21 days almost all of it is water.

Since I've used nothing but this gas I'm not sure if it is increasing my mpg or not over standard gas. I will say my first tank that the dealer gave me I only got in the low 23mpg, and I haven't hit lower than 25 since. But that first tank could have been so bad because I was just getting used to this car after driving my old one for 8 years, or because it wasn't broke-in at all yet, or it could have been the gas or a combination of all three. I don't know.
SubyDoWhreRU is offline   Reply With Quote
Old 04-23-2012, 10:50 AM   #496
flyboy1100
Scooby Specialist
 
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:
2012 2.0i Sport 5MT
DGM

Default

Quote:
Originally Posted by SubyDoWhreRU View Post
I don't necessarily buy it for the MPG boost but for the fact that it protects the engine better and keeps it cleaner and ethanol is TERRIBLE for engines. If you go longer than 7 days between fill ups about 10-30% of that ethanol is evaporated and water has taken its place. After 21 days almost all of it is water.

Since I've used nothing but this gas I'm not sure if it is increasing my mpg or not over standard gas. I will say my first tank that the dealer gave me I only got in the low 23mpg, and I haven't hit lower than 25 since. But that first tank could have been so bad because I was just getting used to this car after driving my old one for 8 years, or because it wasn't broke-in at all yet, or it could have been the gas or a combination of all three. I don't know.
seriously using 97? i understand maybe bumping up to 91/92 with the compression ratio it should work well, but this engine just doesn't have enough compression/timing/anything else required for that high of an octane, it can't even be all burning which means you are wasting gas
flyboy1100 is offline   Reply With Quote
Old 04-23-2012, 11:22 AM   #497
RoyB
Scooby Newbie
 
Member#: 316190
Join Date: Apr 2012
Default

Quote:
Originally Posted by SubyDoWhreRU View Post
I don't necessarily buy it for the MPG boost but for the fact that it protects the engine better and keeps it cleaner and ethanol is TERRIBLE for engines. If you go longer than 7 days between fill ups about 10-30% of that ethanol is evaporated and water has taken its place. After 21 days almost all of it is water.
Curious how water is translated into evaporated ethanol? I usually go a month on filling up my jeep since it's mostly an around town car.
RoyB is offline   Reply With Quote
Old 04-23-2012, 11:26 AM   #498
ocellaris
Scooby Specialist
 
Member#: 302559
Join Date: Nov 2011
Default

Quote:
Originally Posted by RoyB View Post
Curious how water is translated into evaporated ethanol? I usually go a month on filling up my jeep since it's mostly an around town car.
Ethanol absorbs moisture from the air, but I don't think it happens anywhere near the rate that post claims it does. Almost all of that "gas line anti-freeze" stuff is just ethanol (or similar) designed to keep unmixed water out of the gas by absorbing it directly into the gas.

So this means you end up with more total water in the gas, but it doesn't pool up and separate from the gas (which can clog fuel lines, and doesn't burn terribly well ).

Last edited by ocellaris; 04-23-2012 at 12:50 PM.
ocellaris is offline   Reply With Quote
Old 04-23-2012, 12:16 PM   #499
nubsub
Scooby Specialist
 
Member#: 313575
Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:
2012 Impreza 2.0i HB

Default

Quote:
Originally Posted by SubyDoWhreRU View Post
If you bought the impreza only for it's MPG, then of course you're not happy! That's like buying a prius because toyota claims its the fastest hybrid, then complaining about its 10 second 0-60 time and top speed of 90. (Yes these numbers are pulled out of my ass but that isn't the point)

I bought an impreza because of the AWD, and the Boxer, and the awesome styling, and the trusted reliability, and the resale value, and the fact that I've had my car for 3 months and haven't seen a single other one in my city (i like being unique), and for its MPG as the only car that gives me everything else I wanted, the mpg is just a plus. I still would have bought this impreza if it still had last years 27 highway 2.5 EJ engine.
i think you have some good points here. i bought my impreza for a combination of things, including the solid EPA mileage estimates.

however, to be fair, i think for your analogy to hold, it would be something like Toyota claiming that the Prius could do 0-60 in 9.0 s, and it turns out that that was only possible with perfect manual shifting and going downhill in a tailwind. in the real world, the car instead sees high 10s 0-60 times. (i know i'm exaggerating a little in this analogy and you can't manual shift a prius). just like EPA mileage figures, most cars do have manufacturer stated acceleration numbers, and most of us would expect that those would reflect some "expectation" from common/previous experience.

the point is that for common experience, if a car has certain EPA figures, most people know what to expect "real world" with respect to those from their own past experiences. for a lot of people here, there real world experience has been lacking. for me, a 27/36 sticker would suggest for my style driving, i should see low 30s in my mixed driving, and hit over 40 for my highway cruising. i'm only at 700mi on the odometer and doing high 20s for the former and haven't tested out the latter yet.

btw, for the record, i'm ok with the mileage i'm getting as it seems the Impreza fits my driving style, climate, etc. i'll be curious what i end up getting on a long road trip. i was hoping for low 40s with 65-70mph driving based on past experience with other cars, but if not, i'll be ok because i don't do such trips too often. for my mixed driving, i'm getting a little less than suggested by the sticker (hopefully that will shrink after some break in time) but not bad enough for me to be terribly upset. yet, i can see how some people would be really miffed based on what they have reported here. (it is entirely possible that there are a few cars out their with poorly programmed ECU's, etc.)
nubsub is offline   Reply With Quote
Old 04-23-2012, 01:17 PM   #500
pxpaulx
Scooby Newbie
 
Member#: 306218
Join Date: Jan 2012
Chapter/Region: MWSOC
Location: Twin Cities, MN
Vehicle:
2012 Impreza CVT
DarK Grey Met. Sport Prem

Default

Quote:
Originally Posted by nubsub View Post
I think if it's common, it's a bit longer for the impreza vs other cars. My wife's Prius gets poor mileage for just about a mile. No more than 2 and it's doing it's high mileage thing.
I agree it is common, cars typically run at a higher idle/rpm rev range when warming up. What stands out is the length of time that the impreza appears to be staying in this warm-up mode. Most cars move onto regular idle in a minute/mile or so while the impreza seems to stick in this mode for 4-5 minutes from startup.

Quote:
Originally Posted by ocellaris View Post
I also find it odd that some people are really happy with their real world MPG even though they aren't getting close to the window sticker. The logic seems to be "It was better than my last car"

I can't break 36 MPG even when I am doing nothing but driving on the highway and trying to baby the gas as much as possible. My last car was rated 30 MPG highway and I could get close to 35 MPG actual with normal highway driving.
My overall calculated average on fuelly is now 28.4mpg, 4 of the last 6 tanks over 30mpg and the last tank, 362 miles traveled, was 31.4 (best yet - note, gauge read 33.3). After fill-up this morning I've done about 65 miles of driving, and the gauge was reading 38.7 as I backed into the garage. Mostly highway. I am completely happy with the capability of the car, however...

It is the short trips that kill this cars mpg plain and simple, with the extra long warm-up sequence for the engine it kills short trips; hopefully subaru will put out a firmware fix to shorten the warmup sequence.

Also, a tip/something for others to try (CVT owners with paddles). when on roads at freeway speed (55+), whenever I come to a hill I drop the car into 6th gear. This allows you to put your foot down on the gas quite harder than in D without the car thinking you're wanting to floor it. It gives better control to ease your speed lower while traveling uphill (make it up on the down side); if you practice the uphill slowdown to conserve your mpgs already, I think adding the downshift to 6th might give a little better overall conservation.
pxpaulx is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
New Impreza owner, low mpg? stuffedcabbage Newbies & FAQs 34 09-25-2012 10:10 PM
2012 Impreza Reviewed - Whytecliff to Seymour brendan_mac Vancouver Impreza Club Forum -- VIC 16 12-23-2011 01:12 PM
NJ Impreza owners - sighting Dan G General Forum Archive 76 10-06-2000 12:24 AM
Md or Va Impreza owners - I have an Impreza related question. Snoopy General Forum Archive 1 06-05-2000 08:08 AM


All times are GMT -4. The time now is 09:33 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.