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Old 05-06-2012, 05:51 PM   #701
hemophilic
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Quote:
Originally Posted by Commander Keen
I've got 1800 miles on my 5 speed sedan and lifetime MPG average is 29.5 MPG according to receipts (which are a bit lower than the on-board meter). Average speed is about 21 MPH as I've done very little highway driving.

This car has very aggressive deceleration fuel-cut settings. I've seen it cut fuel coasting down to 1100 RPM. Hills can be your friend. Always coast in gear.

The block heater is useful year round with a timer. If you have a fairly regular schedule, the PZEV startup can be minimized or even avoided. The shorter your commute is, the more this will improve your MPG numbers.
That makes me wonder what sensor can be tricked....
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Old 05-06-2012, 07:34 PM   #702
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That makes me wonder what sensor can be tricked....
^^ +1
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Old 05-06-2012, 09:19 PM   #703
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I got mixed milage this winter with a box on top running up to Whitepass from Yakima, in WA State. I was getting around 30mpg driving around 60 average. I have gotten 37mpg going 60 on flat terrain without the box on top. It does get down to driving 60 or less. Face it, it's awd and it's not going to get anywhere close to 36 under normal driving conditions...driving 70 or in town.
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Old 05-06-2012, 09:49 PM   #704
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Quote:
That makes me wonder what sensor can be tricked....
None, really. The PZEVs might idle higher than necessary, but all engines use more fuel when cold.
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Old 05-06-2012, 10:37 PM   #705
Kaupps33
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Hey guys, long time reader first time poster. Thought I'd make a quick contribution to the MPG thread. Just picked up my 2012 impreza sport premium yesterday. Still have yet to fill up but the trip computer is showing 37 MPG after a 5 hour, 62 MPH trip. Pretty acceptable in my book for an engine with about 300 miles on it. Absolutely loving everything about the car!
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Old 05-06-2012, 10:58 PM   #706
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Kaupps, you'll want to avoid trips like that during the break-in period. The manual suggests varied loads and speeds <4K RPM, though they won't return very good MPG numbers.

Good to see another example of great mileage though. Is it a 5MT or CVT?
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Old 05-06-2012, 11:10 PM   #707
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Sorry, forgot to mention it's a CVT. Thanks for the break-in info... couldn't avoid this one, but I'll keep that in mind for the next month or so.
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Old 05-07-2012, 12:54 AM   #708
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Quote:
Originally Posted by Kaupps33
Sorry, forgot to mention it's a CVT. Thanks for the break-in info... couldn't avoid this one, but I'll keep that in mind for the next month or so.
If you need to do an extended ighway trip avoid cruise control and vary your speeds some if you are able to do so safely.

Glad to hear your great mileage report. I've yet to take mine on any highway trip over 10 miles. Looking forward to seeing what I can get now, seeing your numbers and that of others.
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Old 05-07-2012, 08:37 AM   #709
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[quote=Commander Keen;37066141]
This car has very aggressive deceleration fuel-cut settings. I've seen it cut fuel coasting down to 1100 RPM. Hills can be your friend. Always coast in gear.

quote]

Can you tell us which data logger you are using? Thanks.
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Old 05-07-2012, 08:55 AM   #710
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I'm using a ScanGauge II.
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Old 05-07-2012, 01:19 PM   #711
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Default Going to get the ECM and TCM updates

Have just past 7500 miles on our CVT hatch now. We typically get an average of city and highway in our cars with our almost 100% suburban driving. Mileage improved slowly and has been about the same for the last few thousand miles. Hand calculated and adjusted for odometer error, life average and typical tanks are now right about 28.5. Lifetime avg mpg is 28mph ish. Pure suburban driving tanks average around 25mph. The life average is higher from a few longer highway trips.

Car was manufactured in Oct '08 and we picked up December. The overly aggressive downshift/engine braking decel is very annoying- can happen on the very slightest of grades sometimes. The uneven acceleration is also noticeable so the descriptions in the two TSBs fit our experience well. Will attempt with dealer this week. I feel like we're missing 1.5-2.5mpg but I want the updates at least to clear the annoyances.
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Old 05-07-2012, 01:22 PM   #712
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Quote:
Originally Posted by deanm11 View Post
Car was manufactured in Oct '08 and we picked up December.
Impressive
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Old 05-07-2012, 01:24 PM   #713
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Quote:
Originally Posted by deanm11 View Post
Have just past 7500 miles on our CVT hatch now. We typically get an average of city and highway in our cars with our almost 100% suburban driving. Mileage improved slowly and has been about the same for the last few thousand miles. Hand calculated and adjusted for odometer error, life average and typical tanks are now right about 28.5. Lifetime avg mpg is 28mph ish. Pure suburban driving tanks average around 25mph. The life average is higher from a few longer highway trips.

Car was manufactured in Oct '08 and we picked up December. The overly aggressive downshift/engine braking decel is very annoying- can happen on the very slightest of grades sometimes. The uneven acceleration is also noticeable so the descriptions in the two TSBs fit our experience well. Will attempt with dealer this week. I feel like we're missing 1.5-2.5mpg but I want the updates at least to clear the annoyances.
please keep us posted on how the TSB's go for you.

my lifetime MPH i checked this morning is 27 MPH, and the computer is reported an average of 29.7 MPG which i know is about 1 MPG optimistic so far.

interestingly, prior the weekend, i was hovering around 26.1 or less MPG and about 19 MPH average. did more driving this weekend, some freeway, but most notably, suburbia driving with no major "cool downs" between drives, and my MPH ave for this tank is now 27MPH and the mileage is up to 29.1 MPG (all computer)...will tank up later this week after a few more days of bad, short trip driving which will surely drop those numbers down a bit...
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Old 05-07-2012, 01:38 PM   #714
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Quote:
Originally Posted by deanm11 View Post
Have just past 7500 miles on our CVT hatch now. We typically get an average of city and highway in our cars with our almost 100% suburban driving. Mileage improved slowly and has been about the same for the last few thousand miles. Hand calculated and adjusted for odometer error, life average and typical tanks are now right about 28.5. Lifetime avg mpg is 28mph ish. Pure suburban driving tanks average around 25mph. The life average is higher from a few longer highway trips.

Car was manufactured in Oct '08 and we picked up December. The overly aggressive downshift/engine braking decel is very annoying- can happen on the very slightest of grades sometimes. The uneven acceleration is also noticeable so the descriptions in the two TSBs fit our experience well. Will attempt with dealer this week. I feel like we're missing 1.5-2.5mpg but I want the updates at least to clear the annoyances.
'08? Or do you mean '11?
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Old 05-07-2012, 02:08 PM   #715
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Filling up tonight but so far there's a noticeable improvement with the TSB on the gauge at least. Fuelly to follow.
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Old 05-07-2012, 02:14 PM   #716
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Originally Posted by SleepNMnky View Post
Filling up tonight but so far there's a noticeable improvement with the TSB on the gauge at least. Fuelly to follow.
oh. good to hear! definitely report back. it would be good to hear that there is a fix out for the early adopters and at least a partial explanation for the lower than expected mileage numbers.
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Old 05-07-2012, 02:16 PM   #717
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i just checked fuelly: things are slowly creeping up...now at 27.6mpg.

i think when i was first looking at the car a month or two ago, it was in the 26s. summer fuel, break in, and newer cars with the later firmwares bringing numbers up?

btw, i'm assuming fuelly doesn't just average the vehicles but does some global average of total gallons and total miles driven? does anyone know?
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Old 05-07-2012, 08:32 PM   #718
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Updated fuelly https://www.fuelly.com/driver/sleepn...eza?fu=2578885

Last tank prior to ECU flash from the TSB Updates was 25.4 MPG with an average speed of 28 MPH. This was my best MPG except for a 100% highway trip I took in early Feb. My overall lifetime average as of that tank was 22.6 MPG.

This tank after the update was at 27.1 MPG with an average speed of 29 MPH. Identical routes/driving habits as the last tank. This is 1.7+ for me & a 6.7% increase from the tank prior.

An improvement, yes. What I expect overall out of the car, not there yet. We shall see. With the warmer temps and the "break-in" that SOA is claiming of 10,000 miles it can only improve. I'm not sure if this improvement is a result of warmer temps, no more winter fuel blends or the ECU flash/updates, but I'll take any improvement at this point. I have noticed a considerable change/reduction in engine braking and more consistent RPMs in city stop & go traffic than previously.

I'll give this a few more tanks & keep y'all updated as I go. I'm likely going to be letting my dealer run that fuel consumption test though if my mixed MPGs don't get closer to 30. I have 30-40% city driving consistently, so my number will always be "mixed". I have a road trip coming up, 2 of them, where I can post 100% highway #s.

Last edited by SleepNMnky; 05-07-2012 at 08:54 PM. Reason: #
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Old 05-07-2012, 08:36 PM   #719
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Quote:
Originally Posted by SleepNMnky
Updated fuelly https://www.fuelly.com/driver/sleepn...eza?fu=2578885

Last tank prior to ECU flash from the TSB Updates was 25.4 MPG with an average speed of 28 MPH. This was my best MPG except for a 100% highway trip I took in early Feb. My overall lifetime average as of that tank was 22.9 MPG.

This tank after the update was at 27.1 MPG with an average speed of 29 MPH. Identical routes/driving habits as the last tank. This is 1.7+ for me & a 6.7% increase from the tank prior.

An improvement, yes. What I expect overall out of the car, not there yet. We shall see. With the warmer temps and the "break-in" that SOA is claiming of 10,000 miles it can only improve. I'm not sure if this improvement is a result of warmer temps, no more winter fuel blends or the ECU flash/updates, but I'll take any improvement at this point. I have noticed a considerable change/reduction in engine braking and more consistent RPMs in city stop & go traffic than previously.

I'll give this a few more tanks & keep y'all updated as I go. I'm likely going to be letting my dealer run that fuel consumption test though if my mixed MPGs don't get closer to 30. I have 30-40% city driving consistently, so my number will always be "mixed". I have a road trip coming up, 2 of them, where I can post 100% highway #s.
Thx for update. I know it's only one data pt but your increase looks really to be fro
The updates.

Still not sure I believe significant improvements will come at 10k.

But it does sound that regardless your car drives better which is a good thing!
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Old 05-07-2012, 08:47 PM   #720
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Another data point. 55F, no wind, I did a 5.2 mile 'city' trip. On a cold engine, I got 23.8 mpg indicated. 21 mph avg speed. On the way back I got 30 mpg indicated, with a 25 mph avg speed (hit a couple lights perfect).
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Old 05-07-2012, 10:31 PM   #721
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Well this is my first way off computer reading. Same pump as last tank up and also added 80cents to even off tank like last fill up. Computer claimed 28.8mpg with 26moh ave. I calculated 26.9mpg. This is the lowest I've gotten so far. This tank had tons of low mileage driving around town for the first half tank and more mixed for second half.
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Old 05-07-2012, 11:40 PM   #722
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My 2012 Sport Limited was built in October and delivered in December. Took it in last week and the dealer told me that the software was up to date following a scan. I get 29 mpg with mixed driving but I dont like the excessive engine braking. I was also hoping to smooth out the acceleration following an update. My car has not been back to the dealership since I picked it up.

Now I'm confused. Is this TSB real or is my dealer clueless?
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Old 05-07-2012, 11:43 PM   #723
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My 2012 Sport Limited was built in October and delivered in December. Took it in last week and the dealer told me that the software was up to date following a scan. I get 29 mpg with mixed driving but I dont like the excessive engine braking. I was also hoping to smooth out the acceleration following an update. My car has not been back to the dealership since I picked it up.

Now I'm confused. Is this TSB real or is my dealer clueless?
i'm guessing your dealer is clueless based on all the evidence present here... i'd bring them the actual number and description and date.
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Old 05-07-2012, 11:48 PM   #724
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Quote:
Originally Posted by Waterlogged
My 2012 Sport Limited was built in October and delivered in December. Took it in last week and the dealer told me that the software was up to date following a scan. I get 29 mpg with mixed driving but I dont like the excessive engine braking. I was also hoping to smooth out the acceleration following an update. My car has not been back to the dealership since I picked it up.

Now I'm confused. Is this TSB real or is my dealer clueless?
Your dealer may or may not be clueless. If they didn't see the TSB (which many haven't) then THEY don't have the most up to date software likely. If they hooked it up without updating their software that explains why it shows no updates. My dealer had no knowledge of it & updated their software the day they had my car in order to run the latest update on my car.

Call SOA. There should be a range of VINs that it applies to. They can look yours up.

Last edited by SleepNMnky; 05-08-2012 at 12:11 AM.
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Old 05-08-2012, 12:59 AM   #725
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And also keep in mind that Technical Service Bulletins are not obligatory. They are guidance for what to do if a customer has an issue. I think it is debatable if new cars right now have the TSB applied to their car (guys/gals chime in if you have a later production car) I think there is the distinct possibility that it may be applied in an as-needed basis.
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