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04-22-2012, 01:14 AM | #476 |
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Vehicle:2012 WRX STI Dark gray |
I bought the Cobb state 2 kit intake downpipe and exhaust and remapped my ecu so I can say I got better mpg
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04-22-2012, 01:17 AM | #477 |
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04-22-2012, 01:17 AM | #478 |
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04-22-2012, 01:25 AM | #479 |
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I drive 70mph on the freeway and get great mpg but I'm also using 100 octane so I dont know what to say
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04-22-2012, 01:30 AM | #480 | |
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Join Date: Nov 2011
Chapter/Region:
Tri-State
Location: Buffalo, NY
Vehicle:2012 Impreza 2.0i Pr Dark Grey Metallic CVT |
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04-22-2012, 09:43 AM | #481 |
*** Banned ***
Member#: 302570
Join Date: Nov 2011
Location: dear old dixie
Vehicle:2013 XV DGM! |
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.. |
04-22-2012, 09:47 AM | #482 |
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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.
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04-22-2012, 05:27 PM | #483 |
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Join Date: Feb 2012
Chapter/Region:
NWIC
Location: Kirkland WA
Vehicle:2012 Imp 5D Prem CVT Marine Blue |
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 |
04-22-2012, 06:04 PM | #484 | |
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Join Date: Mar 2012
Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
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:
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04-22-2012, 06:42 PM | #485 | |
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Join Date: Mar 2012
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NESIC
Location: Maine
Vehicle:2012 Impreza2.0i 5D Red Pearl |
mpg
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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. |
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04-22-2012, 09:09 PM | #486 |
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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. |
04-22-2012, 11:16 PM | #487 | |
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MWSOC
Location: Twin Cities, MN
Vehicle:2012 Impreza CVT DarK Grey Met. Sport Prem |
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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. |
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04-23-2012, 01:19 AM | #488 | |
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Location: SF Bay Area, CA
Vehicle:2012 Impreza 2.0i HB |
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Last edited by nubsub; 04-23-2012 at 02:10 AM. |
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04-23-2012, 01:27 AM | #489 | |
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04-23-2012, 02:11 AM | #490 | |
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Vehicle:2012 Impreza 2.0i HB |
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04-23-2012, 10:07 AM | #491 | |
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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. |
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04-23-2012, 10:33 AM | #492 |
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Location: Douglassville, PA
Vehicle:2012 Impreza Camellia Red Pearl 5spd |
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. |
04-23-2012, 10:37 AM | #493 |
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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. |
04-23-2012, 10:45 AM | #494 | |
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04-23-2012, 10:46 AM | #495 | |
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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. |
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04-23-2012, 10:50 AM | #496 | |
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04-23-2012, 11:22 AM | #497 | |
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04-23-2012, 11:26 AM | #498 | |
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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. |
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04-23-2012, 12:16 PM | #499 | |
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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.) |
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04-23-2012, 01:17 PM | #500 | ||
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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. |
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