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Old 07-12-2006, 02:38 AM   #1
Glyn
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Member#: 104597
Join Date: Jan 2006
Chapter/Region: W. Canada
Location: Edmonton, AB, Canada
Vehicle:
2006 Forester XT
Garnet Red Pearl

Default Fuel economy in 06FXT.

Does anyone know if gas in Edmonton is particularly poor for fuel economy?

I've done some research here and on SubaruForester.org, and the FXT owners I can find are getting a solid 21 MPG in their city driving. It varies a little bit with how aggressively they drive, but most folks are within 2 MPG.

However, I've been tracking my fuel economy since I bought my new 06FXT in February, and mine never gets above 16 MPG. In the colder months, it dipped as low as 10-12 MPG. I'm only at 7000km and so Rally Subaru assures me there's still break-in to go, but a foreign 04FXT friend has confirmed for me that his mileage never deviated significantly from 21 MPG in the first few thousand miles.

Highway economy is better, of course, but still never breaks past 23 MPG, even though it seems like most FXT owners are hitting the 27 MPG that Consumer Reports indicates.

I've tried varying my tire pressure, changing the oil, sampling different gas stations and driving more conservatively, but I can't seem to make it any better.

What I'm wondering is, could this be a problem with the quality of gas here, or should I be worrying that there's something wrong with my car?

One experiment I'm considering is adding Torco fuel accelerator to the mix, just to test the theory that the gas is the cause.
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Old 07-12-2006, 06:42 PM   #2
Airboy
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Member#: 72829
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary, Canada
Vehicle:
2006 WRX
2015 WRX

Default

That does sound a bit low. I have a 2.5L turbo engine as well and haven't seen much change in fuel economy since new (~11000 km now). Do you drive it really, really hard?

Any details on the highway mileage number(s)? How far, how fast, etc

Using 91 octane gas, I assume?

Do you keep numbers in L/100km as well? I haven't used the MPG much since there are two different Gallon units (3.78L and 4.54L).
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Old 07-12-2006, 10:54 PM   #3
Glyn
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Member#: 104597
Join Date: Jan 2006
Chapter/Region: W. Canada
Location: Edmonton, AB, Canada
Vehicle:
2006 Forester XT
Garnet Red Pearl

Default

Yep, 91 octane.

My normal routes about the city (and I only have a handful of them) limit me to 60kph and 80kph. If I push the limit, it's by no more than 5kph. I accelerate quickly and occasionally skip a gear when rowing up, getting to my desired speed within about 2-3 seconds. I cruise at 2000RPM, and accelerate anywhere between 3000 and 5000. I'd call that assertive rather than aggressive.

When I take it on the highway, I aim for 110kph. I'll get up to my desired speed within about 6-7 seconds and lock it into cruise control immediately for fuel economy. Same range of RPMs as city driving.

Here's an excerpt from my mileage table. It shows my consumption in metric and imperial. I find imperial numbers useful to keep track of too, because it's easier to compare against my American friends.
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Old 07-13-2006, 02:15 AM   #4
Airboy
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Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary, Canada
Vehicle:
2006 WRX
2015 WRX

Default

Man, those numbers in your spreadsheet are scary 14~16 L/100km city? Since getting my WRX in May, I haven't gone above 11L/100km for around-town driving. I don't spend much time in bumper-to-bumper traffic though. For pure highway cruising I get about 8.x L/100km for 100-110kph.

Those June numbers looks pretty steady at 14.x L/100km....

I wonder if data logging would help here. I am sure you could find a local Edmonton member to help out....
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Old 07-13-2006, 12:53 PM   #5
STI-TOM
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Member#: 91724
Join Date: Jul 2005
Chapter/Region: W. Canada
Location: Edmonton
Vehicle:
2006 STi
wrb

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I have an 06 STI and the worst I ever had was just over 13L/100km. I used to run Shell 91 and now am using Husky 94. If I drive normally I'm usually at 11.5-12.5. Your highway mileage looks fine though. You should get an Accessport and see if that helps. Good luck

Tom
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Old 07-13-2006, 08:35 PM   #6
Tuner1
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Join Date: May 2005
Location: Calgary, AB
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My '05 FXT (TBE, VF39, etc) gets ~300km/tank in the city and ~400km/tank on the highway (at ~140km/h).

These babies suck gas

Rob
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Old 07-14-2006, 01:16 AM   #7
fragment
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Member#: 8050
Join Date: Jul 2001
Chapter/Region: W. Canada
Location: Bugeye EJ207 - T3T04S - RIP
Vehicle:
2004 FXTi - Stage 2
Goooooooolld

Default

That's what happens when you push a brick through the air at 110 kph

I woulnd't wait for it to get better like the dealer said. Somethings wrong, and my money is on the MAF sensor. [edit - front O2 sensor is likely too.] Find someone with a wideband A/F meter and see what you have at cruise. It better be 14.6 to 14.8 AFR. I'm betting its in the 14.3 area.

My Legacy GT gives me 9.4 l/100kms at steady state 130 kph. In town, I usually see 11.6 to 12 and I drive it pretty hard.
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Old 07-14-2006, 08:59 AM   #8
Flexx999
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Member#: 36302
Join Date: May 2003
Chapter/Region: W. Canada
Location: St. Albert, Alberta
Vehicle:
2006 Big 16G WRX
Addicted to Blue

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I see over 400kms a tank for city driving in my 2.5 wrx....you should be getting better then that.
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Old 07-17-2006, 03:15 AM   #9
Glyn
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Join Date: Jan 2006
Chapter/Region: W. Canada
Location: Edmonton, AB, Canada
Vehicle:
2006 Forester XT
Garnet Red Pearl

Default

Quote:
Originally Posted by fragment
That's what happens when you push a brick through the air at 110 kph

I woulnd't wait for it to get better like the dealer said. Somethings wrong, and my money is on the MAF sensor. [edit - front O2 sensor is likely too.] Find someone with a wideband A/F meter and see what you have at cruise. It better be 14.6 to 14.8 AFR. I'm betting its in the 14.3 area.

My Legacy GT gives me 9.4 l/100kms at steady state 130 kph. In town, I usually see 11.6 to 12 and I drive it pretty hard.
Is that something I can ask about here? Any local folks willing to offer an A/F meter and a hand in exchange for, oh, I don't know, beer? Whatever you like?
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Old 07-17-2006, 07:21 PM   #10
Phong780
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Member#: 111709
Join Date: Apr 2006
Chapter/Region: W. Canada
Location: Edmonton
Vehicle:
2004 STi
WRB

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hmm...not sure how to calculate L/100km but im sure i know that im gettin about 320km (when driving normal) on a tank in my 04 sti....thats pretty bad and i dunt know why
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