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Old 06-09-2012, 03:18 PM   #1276
Rymar
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Quote:
Originally Posted by G-Omaha View Post
My Dealer could not get it to work...
My dealer (Carlsen Subaru, Redwood City, CA) adjusted the MPG gauge for me. At first they said they had never heard of it, but after I pointed out the page in the factory service manual that shows a plus/minus ten percent adjustment range, they adjusted it downward by 5% (that was my number, which I calculated from multiple fill-ups).

Last two tanks, have had 0.3%, and 0.1% error! So it is possible. They also told me I could bring back the car if the adjustment wasn't right.

Too bad we don't get the "high-grade" MFD (multi-function display) like Canadian models; you can adjust it yourself.
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Old 06-09-2012, 04:31 PM   #1277
G-Omaha
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Do you happen to have the page number in the factory service manual available. If so, please share.

Thanks...
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Old 06-09-2012, 06:50 PM   #1278
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Originally Posted by G-Omaha View Post
Do you happen to have the page number in the factory service manual available. If so, please share.

Thanks...
Yes. I downloaded the FSM from techinfo.subaru.com ($35 3 day membership). Note that you are limited to 50 files an hour, but at least they allow downloads! (Honda and Toyota make it impossible to download a complete FSM from their sites). And, before anyone asks, sorry, I'm not going to share it. First there are the copyright issues, and second, the whole manual is 850 files, and 232MB.

My manual has release number G1120BE5, and the info is in the "IDI" chapter (Instrumentation Driver-Info), section 11. "User Customizing", on page "IDI(diag)-19". There is no detailed information about where in the SSMIII dealer software the setting is; it just says:

For operation procedures, refer to the PC application help for Subaru Select Monitor.

There are three items in the table: external air temp, MPG gauge, and second level seatbelt warning.

External air temperature
compensation value: default: 0C (F), range: -5C (F) +5C (F)

Mean fuel consumption
compensation value: default: 0%, range: +10% -10%

Second level belt warning
customize default: Shifting prohibited options: Shifting prohibited/Shifting permitted
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Old 06-09-2012, 07:02 PM   #1279
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Thanks
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Old 06-10-2012, 01:07 AM   #1280
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Dammit, you need the SSM in order to make those changes...

Interestingly I drove my STI today for about 150 miles on 100% highway and my trip computer said 21 MPG, the actual calculation was 22.8 (btw, the highest I have ever gotten!). The '12 Impreza did the same thing on one long trip, on pure highway it underestimated the MPG.
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Old 06-10-2012, 05:56 PM   #1281
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Had to work Saturday, so took the opportunity to drive 5 under the limit for my 40 mile commute. 72 degrees, no wind, I got 42.3 MPG indicated, and with my gauge over estimating 2.2 mpg on my last fill, that's 40.1 actual mpg. On the way back home, 82 degrees, A/C on full blast, and gusty winds, I got 7 mpg less. The car loves warmer temps in the morning.
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Old 06-14-2012, 09:44 AM   #1282
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finally figured out how to drive this thing to get the best gas mileage. For some reason letting off the gas on down hills engages engine braking. If you just feather the throttle the CVT will stay in it's tallest ratio and stay in lockup. On my morning hwy commute after 12 miles I avg 40.4 mpg. I've found keeping the CVT in that tall ratio is the key, even in uphills...

I was also surprise to see how well the car torques itself uphills at low rpm. I could hold the rpms at around 2k going up a hwy hill and not lose too much speed. Instant indicated 32mpg going up a 20% (give or take) grade at 65mph!
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Old 06-14-2012, 10:03 AM   #1283
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Quote:
Originally Posted by Rymar View Post
My dealer (Carlsen Subaru, Redwood City, CA) adjusted the MPG gauge for me. At first they said they had never heard of it, but after I pointed out the page in the factory service manual that shows a plus/minus ten percent adjustment range, they adjusted it downward by 5% (that was my number, which I calculated from multiple fill-ups).

Last two tanks, have had 0.3%, and 0.1% error! So it is possible. They also told me I could bring back the car if the adjustment wasn't right.

Too bad we don't get the "high-grade" MFD (multi-function display) like Canadian models; you can adjust it yourself.
Even if you could adjust it yourself, you would find each tank is going to be off one way or another. It would just drive you nuts

Last edited by ocellaris; 06-14-2012 at 11:28 AM.
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Old 06-14-2012, 01:52 PM   #1284
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Quote:
Originally Posted by Ladeef View Post
finally figured out how to drive this thing to get the best gas mileage. For some reason letting off the gas on down hills engages engine braking. If you just feather the throttle the CVT will stay in it's tallest ratio and stay in lockup. On my morning hwy commute after 12 miles I avg 40.4 mpg. I've found keeping the CVT in that tall ratio is the key, even in uphills...

I was also surprise to see how well the car torques itself uphills at low rpm. I could hold the rpms at around 2k going up a hwy hill and not lose too much speed. Instant indicated 32mpg going up a 20% (give or take) grade at 65mph!
Agreed, with the CVT if I hit a hill I drop it into manual/6th gear to keep the engine braking from occurring. I'll also drop it into 6th at the slightest hint of an incline to avoid the jumpy revs of even the slightest pedal pressure when the car is in D.
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Old 06-14-2012, 02:13 PM   #1285
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Quote:
Originally Posted by ocellaris View Post
Even if you could adjust it yourself, you would find each tank is going to be off one way or another. It would just drive you nuts
My mpg gauge errors were pretty consistent; these are the percentage errors on the 7 fillups before having the dealer adjust the gauge (all are negative with respect to actual mpg). I know others have seen different results.

6.8%
3.8%
4.6%
5.7%
5.3%
6.6%
4.2%


Since the adjustment, two fillups have both had less than 1% error.

Besides, I'm an engineer (I'm already nuts!).
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Old 06-14-2012, 02:16 PM   #1286
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First tank, calculated: 27.3mpg 60/40 Highway/City

The computer actually showed a little less. I'm satisfied, especially for the first tank of gas ever.
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Old 06-14-2012, 02:27 PM   #1287
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Quote:
Originally Posted by Rymar View Post
My mpg gauge errors were pretty consistent; these are the percentage errors on the 7 fillups before having the dealer adjust the gauge (all are negative with respect to actual mpg). I know others have seen different results.

6.8%
3.8%
4.6%
5.7%
5.3%
6.6%
4.2%


Since the adjustment, two fillups have both had less than 1% error.

Besides, I'm an engineer (I'm already nuts!).
to drive your further nuts ...

have you checked the accuracy of your odometer using Google maps?

i'm 99% sure mine is roughly 3% off. that roughly compensates for my 5% error in the computer.

off topic: so how do you rate the Carlsen service folks? i do most things myself, but if and i ever figure out a way to replicate these rattles or they get worse and become persistent, i'm debating between them (i bought my car from Carlsen) or Capitol.
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Old 06-14-2012, 04:23 PM   #1288
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Just picked up my 2012 Impreza Premium w/CVT two weeks ago so it's nowhere near broken in yet but I'm averaging 28.5-29.2 in the city and about 40.2 highway, liking what I'm seeing so far!
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Old 06-14-2012, 04:42 PM   #1289
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Originally Posted by Hooligan76 View Post
Just picked up my 2012 Impreza Premium w/CVT two weeks ago so it's nowhere near broken in yet but I'm averaging 28.5-29.2 in the city and about 40.2 highway, liking what I'm seeing so far!
Quote:
Location: DFW, TX
Dang people from the south always get the good stuff. In Maine I can barely go a mile before going up or down a hill anywhere in my area, and its been cold enough that I hard to turn on the furnace a few days ago
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Old 06-14-2012, 04:48 PM   #1290
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Quote:
Originally Posted by ocellaris View Post
Dang people from the south always get the good stuff. In Maine I can barely go a mile before going up or down a hill anywhere in my area, and its been cold enough that I hard to turn on the furnace a few days ago
LOL.

reminds me of a quote i heard when i helped a friend move up to northern maine several years ago:

"Up here, there are two seasons. Winter and the Fourth of July."
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Old 06-14-2012, 05:21 PM   #1291
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Quote:
Originally Posted by nubsub View Post
LOL.

reminds me of a quote i heard when i helped a friend move up to northern maine several years ago:

"Up here, there are two seasons. Winter and the Fourth of July."
Michigan's is winter and construction. I swear, the orange cone/barrel is the official state tree or something....
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Old 06-14-2012, 05:36 PM   #1292
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Quote:
Originally Posted by SZRimaging View Post
Michigan's is winter and construction. I swear, the orange cone/barrel is the official state tree or something....
i think that applies to most northern states. MN/ND for sure!
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Old 06-15-2012, 01:25 AM   #1293
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Been watching the MPG closely, as I've never owned a car with the CVT or that's AWD. First tank came out at 25.99 MPG (about 1 MPG below the display) and the second tank came out at 27.41 MPG (again, around 1 MPG lower than the display). Both tanks were mixed city/highway driving, with no prolonged highway miles.

Today I had the chance to do some miles on the interstate, roughly a 30 mile stretch with no bottlenecks or slowdowns, just a few rolling hills and some nice flat straightaways. One way, I locked in the cruise at 77 MPH, moonroof wide open, A/C on low at my feet. Display showed around 30 MPG. Return trip, I locked in at 67 MPH (consistently running around 2100 RPM), nothing open, no A/C, but after dark at a lower temperature. Display showed just shy of 33 MPG. I will be repeating this same drive the next couple days, so I'm gonna try tinkering with how I drive it to see if I can squeeze a few more MPG out. Of course with the car still not broken in, that may change some numbers down the road.

I have noticed with the 'instantaneous' MPG display that at 50-55 MPH, the car seems to consistently yo-yo between the low 30s and the low 60s on the display. I'm kinda wondering if there's a 'sweet spot' in the speed range that the car has been optimized at to get the best MPG...

Definitely changing how I drive somewhat in an effort to optimize my MPG. Gonna take a little while to figure it out, though...
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Old 06-15-2012, 09:55 AM   #1294
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So I got 36.3 MPG indicated on my commute to work. about 16 miles, mostly 55mph country roads with rolling hills, small town with two stoplights. So in total I had to stop at one stop sign, two stoplights, and Subway to grab some breakfast.Probably about 3 miles were at 35mph, 2 miles at 25mph.
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Old 06-15-2012, 12:38 PM   #1295
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Quote:
Originally Posted by cny12owner
Been watching the MPG closely, as I've never owned a car with the CVT or that's AWD. First tank came out at 25.99 MPG (about 1 MPG below the display) and the second tank came out at 27.41 MPG (again, around 1 MPG lower than the display). Both tanks were mixed city/highway driving, with no prolonged highway miles.

Today I had the chance to do some miles on the interstate, roughly a 30 mile stretch with no bottlenecks or slowdowns, just a few rolling hills and some nice flat straightaways. One way, I locked in the cruise at 77 MPH, moonroof wide open, A/C on low at my feet. Display showed around 30 MPG. Return trip, I locked in at 67 MPH (consistently running around 2100 RPM), nothing open, no A/C, but after dark at a lower temperature. Display showed just shy of 33 MPG. I will be repeating this same drive the next couple days, so I'm gonna try tinkering with how I drive it to see if I can squeeze a few more MPG out. Of course with the car still not broken in, that may change some numbers down the road.

I have noticed with the 'instantaneous' MPG display that at 50-55 MPH, the car seems to consistently yo-yo between the low 30s and the low 60s on the display. I'm kinda wondering if there's a 'sweet spot' in the speed range that the car has been optimized at to get the best MPG...

Definitely changing how I drive somewhat in an effort to optimize my MPG. Gonna take a little while to figure it out, though...
I got 3000 miles on my car. I get about 26-28mpg,on a full tank of gas i get about 340-360 miles of combined driving(city and highway). I don't know or it is just me, I observe that you get high mpg on the dash board when you have travelled less that 50-70 miles (Reseting the odometer and computer) As the computer is calculating the mpg on less miles/gallon used. But if you use the full tank of gas the mpg is less as you have more miles/the gallon used. I happens all the time. The beginning it will register 36-37miles but after burning a full tank of gas truly it will average 27mpg, 1 less mpg if I compare it to actual gas consumption versus miles.

Hopefully in the future when cars are advertised 36 mpg highway they need to specify the speed they tested the vehicle. Because the sweet spot I notice on the car is driving bet 45-55mph. Anything above that will burn more gas. I experimented on mph compared to mpg. 80mph: 26mpg, 70 mph: about 27-28mpg, 60mpg:30mpg. Realistically I can't drive 45 mph on the interstate without getting into an accident.
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Old 06-15-2012, 03:02 PM   #1296
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Originally Posted by cycling4fitness View Post
I got 3000 miles on my car. I get about 26-28mpg,on a full tank of gas i get about 340-360 miles of combined driving(city and highway). I don't know or it is just me, I observe that you get high mpg on the dash board when you have travelled less that 50-70 miles (Reseting the odometer and computer) As the computer is calculating the mpg on less miles/gallon used. But if you use the full tank of gas the mpg is less as you have more miles/the gallon used. I happens all the time. The beginning it will register 36-37miles but after burning a full tank of gas truly it will average 27mpg, 1 less mpg if I compare it to actual gas consumption versus miles.
if i understand you correctly, i do not see the behavior you cite. although the mpg can fluctuate a lot early in a tank, i wouldn't say it overestimates the mileage more earlier in the tank.

for eg, this is my first tank where i was doing purely city driving. for the first 100mi, i was averaging 24ish mpg on the computer with an average speed of 17mph. since then, i'm mixed in some highway and its now at 28mpg.

i do find my computer is roughly 5% high, but in my mind that is partially offset by an odometer that reads 3% too low (ie, underreports miles travelled)
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Old 06-15-2012, 05:39 PM   #1297
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Quote:
Originally Posted by cycling4fitness
Hopefully in the future when cars are advertised 36 mpg highway they need to specify the speed they tested the vehicle. Because the sweet spot I notice on the car is driving bet 45-55mph. Anything above that will burn more gas. I experimented on mph compared to mpg. 80mph: 26mpg, 70 mph: about 27-28mpg, 60mpg:30mpg. Realistically I can't drive 45 mph on the interstate without getting into an accident.
EPA highway tests go up to 60 mph and have an average speed of 48.3 mph. You'd be surprised what their testing definitions are versus what your definition would be. Careful not to confuse the two. http://www.fueleconomy.gov/feg/fe_test_schedules.shtml
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Old 06-15-2012, 08:41 PM   #1298
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[quote=cny12owner;37379820]I'm kinda wondering if there's a 'sweet spot' in the speed range that the car has been optimized at to get the best MPG...
quote]

This is what I measured on a flat, tree-lined road. I'm getting about 7 mpg better now than I was at that time, so this may need to be guesstimated upward. Got less than 50 mpg at 25 mph...


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Old 06-15-2012, 09:05 PM   #1299
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What are you using for data logging?
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Old 06-15-2012, 11:05 PM   #1300
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Quote:
Originally Posted by SleepNMnky

EPA highway tests go up to 60 mph and have an average speed of 48.3 mph. You'd be surprised what their testing definitions are versus what your definition would be. Careful not to confuse the two. http://www.fueleconomy.gov/feg/fe_test_schedules.shtml
You are right, very informative link. We can't really compare real world mpg to the way they test. Things I noted was
1. Average distance traveled during the EPA test was 10 miles. Such a short distance to get a good realistic ratio of miles to the gas consumed. As I observed when you reset the computer and travel 10 miles the MPG calculation tend to fluctuate a lot and very sensitive to acceleration and deceleration.
2. Gas burned was measured through the emission with EPA test while we try to compare it with the fuel gauge or amount of refueled gas.

I'm hoping that auto manufacturers would be more detailed when they are advertising car based on their mpg efficiency. Because it is very miss leading to buy a car that is 40 mpg just to realize that you can only achieve that driving around 40-45 mph with no stopping.
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