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Old 07-24-2012, 10:32 PM   #1551
ZionZR2
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Quote:
Originally Posted by ST Eye View Post
Does it calculate the MPG's better than the OEM trip computer?
Well its not the same type of trip avg. the one on the dash resets only when you reset the trip odo. My scangauge gadget AVG MPG shows the avg from engine start to engine off. Since they are not really the same measure you cant really compare them as one better than the other.

the one on the dash is about 5-6% above hand calculated.

I use trip A for each gas tank fill. I use Trip B for Oil Change Interval.

the dash is showing aprox the Tank's avg. mpg and my gadget is showing the particular trip I am running's mpg average. Such as the trip to work or the trip home from work.
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Old 07-25-2012, 04:12 PM   #1552
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Holy cow best tank so far! 100% city. Not a lot of stop and go. Use cruise when I can. Speeds around here are 60kph
607.7km dash avg 7.8 computed 8.5
Used 51.488l
Comes out to about 27.8 mpg.
Had about 3.5l left in the tank when I filled. Probably another 20 km in there.
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Old 07-25-2012, 04:15 PM   #1553
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Oh and it was 27 days since last fill up. Just over 3500km life on the car
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Old 07-26-2012, 12:00 AM   #1554
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Quote:
Originally Posted by ZionZR2 View Post
the one on the dash is about 5-6% above hand calculated.
I thought the same about mine until I started correcting for my odometer, which reads 5% low (I drive 20 miles, it says 19). Taking that into account, my on dash mpg estimate has been only .3 - .7 mpg high.
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Old 07-26-2012, 12:20 AM   #1555
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Originally Posted by Zeeper View Post
I pretty much drive the same way I always have. I am not a hyper miler, though I am pretty easy on the car.

I know if I start hammering it my MPG's will go down, and I know if I drive the way I usually drive where I usually drive I will be right around 29mpg in this car. This is about 3mpg less than a 2008 Elantra yielded. I like the subaru better so no regrets.

The gauge may be useful for you. I look at it occasionally, it is only slightly entertaining and it does not affect my driving behavior at all.
Hyper mileing is new to me, and I do like the gauge - it's simple. The payoff/entertainment for me is the average mpg when the odometer passes 400 miles. I am on track to hold 38 mpg on this tankful.

Let's face it though, if that was my prime concern I would have bought the Prius I looked so hard at (no regrets here either). At the next fillup I plan to turn the mpg display off and drive for the fun of it, and see what mileage I get. I think the Subie will still use less fuel than my 2.5 02 Altima did.
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Old 07-26-2012, 09:57 PM   #1556
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Hi everybody!! I'm new to NASIOC and my 2012 WRX. I traded my truck in for the WRX because I wanted a more fun/sporty ride, and justified some of the difference in payments by the savings in gas mileage. I had a Ford Ranger and it got about 17-18 mpg without putting much thought into it, and so far I have almost 2k miles on the WRX and I'm getting about 22 mpg already according to the dash gauge, no manual calculations.

I am looking to stretch it to at least 25-26 mpg on average, driving 80% highway, which might be more of a goal than obtainable, but that's how I roll .
I've been reading through some of these threads and began to wonder if any hypermilers have tested, and or proved/busted any mods. Whether they're stereotypical horsepower mods, i.e. intake/exhaust, or something that a lead foot wouldn't think of, a hypermile mod.

I know it seems like an oxymoron and the best mod for gas mileage is to not use my lead foot as it was designed, and I know this is an Impreza thread not a WRX thread, but that's sorta the point for posting this here. The attention to gas mileage seems more pure.

Thanks
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Old 07-26-2012, 11:00 PM   #1557
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I am just over 5200 miles on a Sport Premium 5MT. Typical fuel tank consists of 80% city and 20% highway. Average MPG is 30-31 per fill up. I think my total average MPG since getting the car is now around 29mpg. When I have more highway driving, I am getting around 38mpg.
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Old 07-26-2012, 11:04 PM   #1558
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anyone else notice the odometer is off but the speedometer is perfect?
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Old 07-26-2012, 11:09 PM   #1559
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Quote:
Originally Posted by flyboy1100 View Post
anyone else notice the odometer is off but the speedometer is perfect?

No, not me.
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Old 07-26-2012, 11:31 PM   #1560
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Quote:
Originally Posted by 53x12 View Post
No, not me.
my gps is spot on, i double checked it against the 20,000.00 gps in my airplane today. but when comparing my odometer against mile markers i am off 3.8%, even though the speedometer is correct.
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Old 07-26-2012, 11:50 PM   #1561
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Quote:
Originally Posted by flyboy1100 View Post
my gps is spot on, i double checked it against the 20,000.00 gps in my airplane today. but when comparing my odometer against mile markers i am off 3.8%, even though the speedometer is correct.

Any correlation between wheel size and speedometer/odometer accuracy?

I have the Premium 16" wheels with stock tires and both speed and odometer is spot on, per two different GPS units.

Average mpg gauge is consistently optimistic though.
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Old 07-27-2012, 01:51 AM   #1562
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Quote:
Originally Posted by flyboy1100
anyone else notice the odometer is off but the speedometer is perfect?
Yep. That's the case for me. Speedometer is spot on, odometer under reports but just over 3% and mileage computer is over optimistic by 5%.
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Old 07-27-2012, 07:18 AM   #1563
ZionZR2
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Quote:
Originally Posted by thom52 View Post
Any correlation between wheel size and speedometer/odometer accuracy?....
I thought that at first but according to the Tire Size Calculator
there is no significant difference in overall diameter in the different wheel size options available in any of the impreza line.
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Old 07-27-2012, 10:41 AM   #1564
SleepNMnky
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Quote:
Originally Posted by ZionZR2

I thought that at first but according to the Tire Size Calculator
there is no significant difference in overall diameter in the different wheel size options available in any of the impreza line.
Somewhere in the monstrous 2012 Impreza Thread it was shown that the 17" wheels tire size is 0.2" larger than the base 15". Not sure about 16" wheel size.
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Old 07-27-2012, 11:30 AM   #1565
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Quote:
Originally Posted by SleepNMnky

Somewhere in the monstrous 2012 Impreza Thread it was shown that the 17" wheels tire size is 0.2" larger than the base 15". Not sure about 16" wheel size.
Doesn't explain the odometer differences though
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Old 07-27-2012, 01:20 PM   #1566
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Of course it does, if the outer diameter of the tire is larger, your odometer will read less. That is if there is no correction.
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Old 07-27-2012, 02:17 PM   #1567
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Quote:
Originally Posted by ST Eye
Of course it does, if the outer diameter of the tire is larger, your odometer will read less. That is if there is no correction.
but why is the speedometer correct? How can that be correct and the odometer incorrect?
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Old 07-27-2012, 02:55 PM   #1568
pxpaulx
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Quote:
Originally Posted by KillaK84 View Post
Hi everybody!! I'm new to NASIOC and my 2012 WRX. I traded my truck in for the WRX because I wanted a more fun/sporty ride, and justified some of the difference in payments by the savings in gas mileage. I had a Ford Ranger and it got about 17-18 mpg without putting much thought into it, and so far I have almost 2k miles on the WRX and I'm getting about 22 mpg already according to the dash gauge, no manual calculations.

I am looking to stretch it to at least 25-26 mpg on average, driving 80% highway, which might be more of a goal than obtainable, but that's how I roll .
I've been reading through some of these threads and began to wonder if any hypermilers have tested, and or proved/busted any mods. Whether they're stereotypical horsepower mods, i.e. intake/exhaust, or something that a lead foot wouldn't think of, a hypermile mod.

I know it seems like an oxymoron and the best mod for gas mileage is to not use my lead foot as it was designed, and I know this is an Impreza thread not a WRX thread, but that's sorta the point for posting this here. The attention to gas mileage seems more pure.

Thanks
Hypermiler mods eh? Wood block under the gas pedal would be the first one. Large front and rear facing cones on the car to break wind...so to speak.

Hypermiling techniques are definitely more difficult in an automatic, so if you've got a stick you're ahead of the curve. The most basic rules I abide by (when I want to get the best mpg) are: slowly getting up to speed, and once there, feather the pedal and don't touch the brake if you can - I drive slow in the straights and take corners as fast as possible. Getting your speed slowly then maintaining it without losing momentum to your brakes are easily the top things to do.

If you can keep your car between 60-65mph as much as possible, that is where most cars sip the fuel.

Also, when going uphill, drive with load (as in, don't accelerate to maintain speed, keep the engine at a constant rpm instead). You obviously can't always do this depending on the size/length of the hills, but it helps too (but goes back to #1 - don't accelerate hard/fast).
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Old 07-27-2012, 05:48 PM   #1569
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Display said 29 and calculated was 28 yesterday. That is the best I have been able to achieve since I bough the car.
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Old 07-27-2012, 09:28 PM   #1570
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Quote:
Originally Posted by flyboy1100 View Post
but why is the speedometer correct? How can that be correct and the odometer incorrect?
Just about every car I have owned shows the speedo 1-2 miles per hour faster than actual. Probably for liability reason. This car shows pretty spot on. Perhaps that delta is lessened because of the diameter difference. Just a thought!
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Old 07-27-2012, 09:37 PM   #1571
pxpaulx
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we moved a few weeks ago and I had been driving our fiat since I have the longer commute (22 miles, wife is only 9). Well, my commute is about as ideal from gas mileage perspective as possible, so I drove the subie this week. Car reads 35.7mpg at about 230 miles on the tank...even if that turns out to be 34mpg calculated it'll be by far my best tank. Average mph is reading 41mph at the moment as well, definitely the fastest average speed I've had on a tank as well. My new drive is basically flat, no traffic to work, about 7-10 minutes of stop and go on the way home then opens up again, both work and home are right off the highway (like i said, ideal for high mpg). Looks like I'll be driving the subie afterall, though the fiat is quite fun (and pulls down 40mpg on the same drive).
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Old 07-27-2012, 11:49 PM   #1572
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Up to 28.5 mpg average!


Last tank was almost all highway over 5 days, speed average of around 72mph, 30.6mpg, i don't think i can complain about that one bit! I even have over 50 miles on that tank at 85mph
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Old 07-28-2012, 01:23 AM   #1573
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Quote:
Originally Posted by flyboy1100
Up to 28.5 mpg average!


Last tank was almost all highway over 5 days, speed average of around 72mph, 30.6mpg, i don't think i can complain about that one bit! I even have over 50 miles on that tank at 85mph
Nice! 28.7 is my running avg. (based on last 10 fill ups) with a lifetime of 25.4. I try to look at my running average since more than half of the lifetime for my car was BEFORE the TSB updates. I have a build date of 10/11
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Old 07-28-2012, 01:24 AM   #1574
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Dang you guys are babying those things. My lifetime is somewhere around 26.5 with a build of 5/12. Guess I just like actually driving
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Old 07-28-2012, 08:10 AM   #1575
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Quote:
Originally Posted by pxpaulx

Hypermiler mods eh? Wood block under the gas pedal would be the first one. Large front and rear facing cones on the car to break wind...so to speak.

Hypermiling techniques are definitely more difficult in an automatic, so if you've got a stick you're ahead of the curve. The most basic rules I abide by (when I want to get the best mpg) are: slowly getting up to speed, and once there, feather the pedal and don't touch the brake if you can - I drive slow in the straights and take corners as fast as possible. Getting your speed slowly then maintaining it without losing momentum to your brakes are easily the top things to do.

If you can keep your car between 60-65mph as much as possible, that is where most cars sip the fuel.

Also, when going uphill, drive with load (as in, don't accelerate to maintain speed, keep the engine at a constant rpm instead). You obviously can't always do this depending on the size/length of the hills, but it helps too (but goes back to #1 - don't accelerate hard/fast).
And if you are going downhill stay in gear (not neutral) to keep fuel from flowing through the injectors to maintain idle).
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