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Old 12-26-2012, 08:57 PM   #2701
stevehnm
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Quote:
Originally Posted by vwgti123 View Post
Is that 2.7% to the (+ or the -) So my car is piling up more miles than I have actually driven? When I use my GPS the speedo MPH is pretty spot on with the GPS display MPH.
Why they can't align the speedometer with the odometer is a puzzle. Odometers are generally about 2% slow with new tires, so with 1.4" tread and 25" diameter they are right on when the tires are bald. The speedometer is right on with new tires and then would read 2% fast with bald tires. (I don't know anyone who drives their tires until bald, but maybe that's just me...) Maybe the speedo/odo differential is a safety feature (?)

Your problem with the dashboard indicator is also pretty much in line with others - it reads about 10% optimistic, I guess to please those not good enough in math to figure it out themselves. Combining the two errors the dashboard indicator is about 8% optimistic.

As far as your mpg, you must have the cvt. There are some here who are apparently incapable of hand calculations and get their 5 speeds mixed up with the better proclaimed mpg of the cvt, and so say the cvt "is pretty close" to advertised but comparing to other cars it is way off. Conjecture is since the cvt can be "tuned" it was tuned to maximize mpg on the EPA test without regard to reality, as you are pretty much in line with the majority of other cvt drivers on this board. Mpg of the cvt is indeed sadly lacking.

It will get 1 to 2 mpg better, but that's about it. I am curious what happens with I replace the fluids with a Group IV synthetic.
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Old 12-26-2012, 09:15 PM   #2702
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Originally Posted by vwgti123 View Post

Is that 2.7% to the (+ or the -) So my car is piling up more miles than I have actually driven? When I use my GPS the speedo MPH is pretty spot on with the GPS display MPH.
Speedo is perfect, odometer is slow. My odometer is 2.8% slow

Last edited by flyboy1100; 12-26-2012 at 09:23 PM.
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Old 12-26-2012, 09:25 PM   #2703
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Originally Posted by stevehnm View Post
Why they can't align the speedometer with the odometer is a puzzle. Odometers are generally about 2% slow with new tires, so with 1.4" tread and 25" diameter they are right on when the tires are bald. The speedometer is right on with new tires and then would read 2% fast with bald tires. (I don't know anyone who drives their tires until bald, but maybe that's just me...) Maybe the speedo/odo differential is a safety feature (?)
Basically. As I understand it, there's a legally allowable range of speedometer error... I don't know the actual numbers, but let's say -5%/+10%. So you make a speedometer that is usually accurate 7%... but this falls outside of the allowable range. So you adjust it so the speedometer reads a little fast so even the ones that fall at the ends of the accuracy range are within the legal tolerances.
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Old 12-26-2012, 09:57 PM   #2704
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Quote:
Maybe the speedo/odo differential is a safety feature (?)
High-reading odometers and low-reading speedometers both could get auto manufacturers in trouble.

I haven't checked the Impreza, but you might find that the OBDII speed reading is correct, and the speedometer is slow.
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Old 12-26-2012, 10:58 PM   #2705
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Originally Posted by Commander Keen View Post
High-reading odometers and low-reading speedometers both could get auto manufacturers in trouble.
I think that's why the speedometer reads fast and the odometer reads slow when the tires are half worn, and the speedometer is right with new tires while the odometer is right with no tread left. Both are worst case errors, but right on with the appropriate conditions.
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Old 12-29-2012, 03:04 PM   #2706
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Here is the milage we are getting with ours, it has the CVT.

The lite gray line is what the dash display mpg was.

Just about every tank was 87. The last tank was 89.

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Old 12-29-2012, 05:01 PM   #2707
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Originally Posted by brapple View Post
Here is the milage we are getting with ours, it has the CVT.

The lite gray line is what the dash display mpg was.

Just about every tank was 87. The last tank was 89.
At first glance, I thought this was my stock portfolio.
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Old 12-29-2012, 05:16 PM   #2708
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Originally Posted by brapple View Post
Here is the milage we are getting with ours, it has the CVT.

The lite gray line is what the dash display mpg was.

Just about every tank was 87. The last tank was 89.

I apologize but can you summarize the results.. Not sure what they represent? What are your findings?
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Old 12-29-2012, 05:25 PM   #2709
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I apologize but can you summarize the results.. Not sure what they represent? What are your findings?

I don't really have any results. I was just sharing the mpg from our 2012 w/CVT since new to add to the discussion.

My one observation, and I think it has been discussed here, is that the reported mpg by the onboard computer is higher then what the real mpg is.

The white line is the calculated mpg and the red line is the trend line. The grey line is the trip computer mpg. Not suprisingly the milage has dropped as we got into the winter.
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Old 12-29-2012, 07:10 PM   #2710
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Originally Posted by brapple View Post
I don't really have any results. I was just sharing the mpg from our 2012 w/CVT since new to add to the discussion.

My one observation, and I think it has been discussed here, is that the reported mpg by the onboard computer is higher then what the real mpg is.

The white line is the calculated mpg and the red line is the trend line. The grey line is the trip computer mpg. Not suprisingly the milage has dropped as we got into the winter.
Thanks for the explanation. I needed the CVT for my daily commute, but I am truley disapointed with the real world MPG's of this car. I sold my 2010 VWGTI b/c of the 6spd and dealing with traffic, but oh man what a difference with MPG's and just daily driving satisfaction. Warranty was about to expire on VW so that also played into purchase decision.. but if I had to do all over again.. I would have kept the VW. Hate to say it but this will probably be my last subaru.. I just prefer the ride, handling of German cars I guess. I do love the AWD of the Imrezza though. Actually enjoy driving the car in bad weather vs good if you can believe that. Good Luck with your car.
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Old 12-29-2012, 09:28 PM   #2711
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I should note that the wifes commute to work is 35 miles, with 15 minute of back roads, 15 minutes of highway and then 15 minutes of back roads, one way. So the milage is made up of that driving and a few longer trips on the highway on weekends.

I am impressed and disappointed with the mpg vs what was on the window sticker. Even more so when my 2012 focus is averaging 32 mpg over 14k miles. However, for being awd I am impressed with the mpg.
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Old 12-29-2012, 09:35 PM   #2712
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I should note that the wifes commute to work is 35 miles, with 15 minute of back roads, 15 minutes of highway and then 15 minutes of back roads, one way. .
Wait... that's 45 miles? Math is hard.
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Old 12-29-2012, 09:42 PM   #2713
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Wait... that's 45 miles? Math is hard.

no, the distance is 35 miles one way, but the total trip time takes 45 minutes one way.
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Old 12-30-2012, 12:32 AM   #2714
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Looking like around 32-33mpg (primarily interstate set at 73mph) for day so far, and above 30mpg for the entire trip, not too shabby for my little 5sp :-)
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Old 12-30-2012, 01:06 AM   #2715
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Originally Posted by BrysImpreza View Post

Wait... that's 45 miles? Math is hard.
It would seem comprehensive reading is harder than math

Last edited by von Wachtstain; 12-30-2012 at 01:44 AM.
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Old 12-30-2012, 09:06 AM   #2716
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It would seem comprehensive reading is harder than math
Yeah, several pints and forum browsing don't mix.
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Old 12-30-2012, 07:08 PM   #2717
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Just got home; 2050.8 miles, 69.2 gallons, 29.6mpg.

First 350 miles were 80ish mph
Next 400 was 67-68mph
Then 100 miles @ 40-50mph on snowy roads.
250 in town/to from Rocky mountain national park/ etc etc
Remaining miles 73mph driving home.

I'm pleased


I should also add, the trip computer I had set for this trip reported 29.7mpg, so between my 2.9% odometer correction and the 3% adjustment I had the dealer make, I'm pretty much reporting correct mpg

Last edited by flyboy1100; 12-31-2012 at 05:44 AM.
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Old 01-01-2013, 03:20 PM   #2718
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New here. My wife and I have a '12 sport limited. 8000 mi. has averaged 38-42
since new. LOVE IT!
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Old 01-01-2013, 03:40 PM   #2719
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Quote:
Originally Posted by BrysImpreza View Post
Wait... that's 45 miles? Math is hard.
Quote:
Originally Posted by von Wachtstain View Post
It would seem comprehensive reading is harder than math
Tell me about it! BrysImpreza, I came up with that too, lol. Minutes look like miles 1 time out of 100.
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Old 01-01-2013, 05:04 PM   #2720
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New here. My wife and I have a '12 sport limited. 8000 mi. has averaged 38-42
since new. LOVE IT!
I dont see how that is possible
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Old 01-01-2013, 05:13 PM   #2721
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I would say it's possible if:
  • He drives longer trips that allow the engine to warm up and stay that way for an extended period.
  • The roads he travels on are flat, and don't have a lot of traffic lights/stop signs.
  • He accelerates from a stop gingerly.
  • Once he gets going on these roads, he holds his speed at 60 mph or less.
  • It wouldn't hurt if he fills with no-ethanol gas.
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Old 01-01-2013, 06:42 PM   #2722
flyboy1100
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Originally Posted by sgoldste01 View Post
I would say it's possible if:
  • He drives longer trips that allow the engine to warm up and stay that way for an extended period.
  • The roads he travels on are flat, and don't have a lot of traffic lights/stop signs.
  • He accelerates from a stop gingerly.
  • Once he gets going on these roads, he holds his speed at 60 mph or less.
  • It wouldn't hurt if he fills with no-ethanol gas.
with the same temps I have been seeing for the last 6 weeks + winter blend gas I saw the same mpg on my trip as i was getting during the summer. so it is definitely possible and I agree with you
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Old 01-01-2013, 07:09 PM   #2723
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we do not use ethanol. My wife drives it daily, about 20 miles to work (country roads) some town driving. Last summer we took a day trip to Minneapolis (about 350 mi round trip mostly
interstate. The dash trip had not been reset for a couple of weeks and read 39 mpg. I drove
mostly about 75mph when we got home it had climbed to 42 mpg. we have tested it many times with always the same results. I'm left scratching my head when i read most of this thread. I cant explain it. and I'm a lead foot driver!
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Old 01-01-2013, 08:57 PM   #2724
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Originally Posted by jomofree1 View Post
we do not use ethanol. The dash trip had not been reset for a couple of weeks and read 39 mpg.
Th lack of ethanol is definitely part of the better mileage, but using the computer based mpg could be inaccurate.

Hand calculate the mileage a few times. I'll bet it drops a bit.
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Old 01-01-2013, 10:00 PM   #2725
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Originally Posted by Rememo View Post
Th lack of ethanol is definitely part of the better mileage, but using the computer based mpg could be inaccurate.

Hand calculate the mileage a few times. I'll bet it drops a bit.
It seems there is an extreme minority that reports this much better mileage, except those following sgoldste01's rules. Maybe it's the no-ethanol mix, although jomofree must be using avgas, as Iowa and Minnesota both have ethanol in their gasoline, and I would guess avgas would give substantially better mpg.

On the whole, I am skeptical of the actual mpg, as to go from 400 miles at 39 mpg to a total of 42 mpg for the 750 miles means the 350 miles were at least 45 mpg, and at 75 mph...

Methinks calibration of the dash gauge is in order...
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