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Old 11-26-2006, 09:05 PM   #1
Racer Dubya
some old guy
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Location: Anchorage
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Default Cold Weather vs. Mileage

This is the first winter I have had a turbo charged car in cold weather. Is it normal to loose a few MPG when the weather gets very cold (as it has been the last week or so).

I noticed during my last tank of gas that I got about 35-40 less miles to the tank and my trip computer is showing my average is down about 3-3.5 per gallon.

My tire inflation is fine (I checked).

Just want to know if this is the norm for the season.
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Old 11-26-2006, 09:18 PM   #2
00Maddog
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2004 ra'd redrex in
8k w/ STI kit :) DASH

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really cold starts increase the injector duty cycle a lot, so that first few minutes is where your fuel is going. the temp guage reads to -40....and adds fuel all along the way....
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Old 11-26-2006, 09:39 PM   #3
EvolvedAK
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Quote:
Originally Posted by Ralph Swan View Post
This is the first winter I have had a turbo charged car in cold weather. Is it normal to loose a few MPG when the weather gets very cold (as it has been the last week or so).

I noticed during my last tank of gas that I got about 35-40 less miles to the tank and my trip computer is showing my average is down about 3-3.5 per gallon.

My tire inflation is fine (I checked).

Just want to know if this is the norm for the season.
Stop drifting so much and you won't have any issue
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Old 11-26-2006, 09:43 PM   #4
02redwagone
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My gas is fuming out of my hoses under the intake manifold I guess. (according whats on this board) Its hard to drive when your huffing gas through the vents to stay warm. Of course recirculate frosts the inside of the windows.
Its time for the cold to go away until I can afford the fix.


(hopefully this is truly a cold weather issue)
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Old 11-26-2006, 10:57 PM   #5
edo2000
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Quote:
Originally Posted by Ralph Swan View Post
This is the first winter I have had a turbo charged car in cold weather. Is it normal to loose a few MPG when the weather gets very cold (as it has been the last week or so).

I noticed during my last tank of gas that I got about 35-40 less miles to the tank and my trip computer is showing my average is down about 3-3.5 per gallon.

My tire inflation is fine (I checked).

Just want to know if this is the norm for the season.
This is normal. An aquaintance of mine is a chemical engineer at Tesoro refinery. He was telling me recently that the composition of gasoline and diesel for the Alaska market changes as temperatures drop. Gas is made up of several different hydrocarbon compounds which have different boiling/vaporization points. If the vaporization point of your gas is too high, then it won't vaporize at low temperatures and your car can't start when the engine is cold. So, the refinery will add lighter products to gas in the winter, lowering the vaporization point but reducing the amount of btu's(energy) in each gallon. This lowers gas mileage. Other factors are longer warm up periods, more rolling resistance in the drivetrain, heavier alternator and heater use, etc., all of which also tend to lower gas mileage.

My wrx averages around 24mpg in the summer, 21-22 in the winter.
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Old 11-26-2006, 11:49 PM   #6
00Maddog
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^^this also causes other things, cars need to relearn fuel trims twice a year or maybe more if you use mutiple stations. this can cause check engine lights poor performance and mileage. the gas really changes a lot.
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Old 11-26-2006, 11:54 PM   #7
MeLLoWd_WRX
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Plug your car in, or park in a garage. I plug my car in every night. I've got a block heater and battery warmer. My car never struggles to start and I get about 24mpg in the winter and about 26 in the summer. Let her warm up for about 10 min. Car is always a little stiff for the first few miles.

Ralph Swan: What do you get for mpg in your Legacy?
*Hope can answer this too, since she's got an Auto too*
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Old 11-27-2006, 01:12 AM   #8
Racer Dubya
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Quote:
Originally Posted by MeLLoWd_WRX View Post
Plug your car in, or park in a garage. I plug my car in every night. I've got a block heater and battery warmer. My car never struggles to start and I get about 24mpg in the winter and about 26 in the summer. Let her warm up for about 10 min. Car is always a little stiff for the first few miles.

Ralph Swan: What do you get for mpg in your Legacy?
*Hope can answer this too, since she's got an Auto too*
I'm in a garage at night and plugged in during the day. I was getting 18-19mpg (since I do mostly city driving) and now I am at 15-16 (since it got down to single digits).
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Old 11-27-2006, 01:17 AM   #9
tribalwrx
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wish i saw atleast 20 mpg in the summer, but i'm a bit to right foot happy even in the winter

man i need a wbo2 to lean this b*tch out
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Old 11-27-2006, 01:26 AM   #10
cooparu
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Even my non-turbo car sees this (as does the Fit, it got 22mpg last tank). My last fillup was 19mpg, and half of that tank was before the cold really set in. On Kauai, we had a 2.5i, auto, and it consistently got 31 mpg. My car gets 23 for city driving in the summer, 18-19 in the winter. Best highway has been 28, about a month and a half ago.

Warm weather and rain is on the way.
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Old 11-27-2006, 01:48 AM   #11
Racer Dubya
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Before the LegaSti I had a truck so I didn't think twice about crappy milage in the winter due to switching to 4WD and because... it was a truck.
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Old 11-27-2006, 02:10 AM   #12
soldmyboxster
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Hell, my Prius is barely going to eek out 31 MPG this tank. Super-cold weather and long warmups FTL.
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Old 11-27-2006, 03:42 AM   #13
Kiwi Fella
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What about denser air = more fuel?
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Old 11-27-2006, 04:23 AM   #14
SleeperLGT
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I still seem to average about 20 mpg, I'd like to ease up with my right foot to see what I can get, but after just installing an accessport I never feel like it that much. And most of my driving is at 55.

Ralph: Are you going off your computer, or calculating it yourself. I hear the computer is a bit optimistic.
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Old 11-27-2006, 12:15 PM   #15
Mavrik
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my non turbo sucks fuel in the winter cold... then again... I leave my car running a lot too.
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Old 11-27-2006, 10:34 PM   #16
The Iglooman
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I agree that letting a car get warm in the winter is a good idea for engine life but it WILL kill you gas mileage. You are just idling there and not going anywhere. That's, like, 0 MPGs right there. Duh! J/K

And the winter gas mix should have something to do with it as well.
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Old 11-29-2006, 05:46 AM   #17
BADxDUCKY
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what about going from regular tread to studded tires? i know that slightly different sized tires affect mileage a bit, but do studded tires have anything to do w/ it?
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Old 11-29-2006, 01:07 PM   #18
prometheum
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Quote:
Originally Posted by Kiwi Fella View Post
What about denser air = more fuel?
negligible, its all the composition of the gas
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Old 11-29-2006, 11:04 PM   #19
siamiam
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all the extra idling is killing my gas mileage
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Old 11-30-2006, 02:34 AM   #20
NikFu S.
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I went from 17-19mpg to 12-14. ):
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Old 11-30-2006, 04:02 AM   #21
02redwagone
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Having stock sized tires on stock wheels (as compared to huge 225 65s) for the first time got me over the 300 mark finally. 40 psi doesnt hurt eather.
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Old 11-30-2006, 04:02 AM   #22
ponamy
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my last fillup was around a little less than a 1/4 tank and i had about 80-100 miles on my tripmeter, you anchorage folks think you get bad gas mileage in the winter, come to fairbanks for a winter and your views on anchorage winter will change a bit lol

-20 ftl at a 20 minute idle to warm your car up
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Old 11-30-2006, 12:12 PM   #23
Minimaul
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I get 31mpg in summer and about 28-29mpg in winters. but, i also let my car warm up for a few minutes in the morning before work and after work before going home. those are all highway miles. more city driving = lower.

just before it snowed even with warming up my car I got 31.5 mpg! I was stoked! that's way better than the 16mpg i was getting in my 4runner. which is partially why i got rid of it.
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