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Thread: Improved Fuel Economy w/ Winter Gone?

  1. #1
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    Default Improved Fuel Economy w/ Winter Gone?

    I'm not talking about gas used to warm up your car.

    Recently, I've been getting ~11.5km/L with non-condervative city driving.
    Current Cars:
    2019 BMW X3 M40i Stage 2, 12.44 at 110mph
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2004 GMC 2500HD 8.1L

    Past Cars:
    1970 Chevy Blazer, 2wd
    2003 BMW X5 4.6IS Doushmobile, moneypit
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108mph
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  2. #2
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    Default

    makes sense. I noticed my fuel economy went down since winter ended. Maybe cuz I bag the shit out of it everywhere I go now hahaha.

  3. #3
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    Default

    Generally milage goes down in winter so its safe to assume that it will rise with the temperature as well as fall with it.

    But 11.5, what are you driving?

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    I get better mpg after the snow is gone.

    b18a

    I think it might be because ppl are not driving like the elderly and there is more time spent in higher gears, rather then stopping and starting like in the winter.
    Current Cars:
    2019 BMW X3 M40i Stage 2, 12.44 at 110mph
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2004 GMC 2500HD 8.1L

    Past Cars:
    1970 Chevy Blazer, 2wd
    2003 BMW X5 4.6IS Doushmobile, moneypit
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108mph
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  5. #5
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    Default

    well make sure you do a spring tune up too! every spring I always get a fuel filter, spark plugs, cap & rotor. But I guess I always ge ta new engine swap every spring......
    I'm going to buy a 89 camaro.

  6. #6
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    Colder ect/act= richer mixture.
    Plus many people like to let their cars warm up for excessive periods of time.
    Ford tuning guy...

    I have too much respect for the idea of God to make it responsible for such an absurd world.
    Georges Duhamel

    joke of the day:
    Originally posted by Danger_Mouse
    There is a replacement for displacement. It's called technology.

  7. #7
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    I think cold air = denser air = more air/fuel = lean

    but don't efi's keep the a/f ratio constant?
    I what I wrote it right, it makes sense to use more fuel in colder weather because the air would be denser, but the a/f ration would be the same.
    Current Cars:
    2019 BMW X3 M40i Stage 2, 12.44 at 110mph
    1972 Chevy Super Cheyenne C10 Pickup 402 big block, 700R4
    2004 GMC 2500HD 8.1L

    Past Cars:
    1970 Chevy Blazer, 2wd
    2003 BMW X5 4.6IS Doushmobile, moneypit
    2015 Ford Fiesta ST | Cobb Stage 1, catless downpipe
    2008 Corvette Z06 - 11.39 at 123.8mph
    2002 Corvette Z06 - 12.10 at 116.5mph
    2005 Jeep Wrangler LJ
    1993 5L Mustang - 12.59 at 108mph
    1989 5L Mustang
    1990 Jeep Cherokee
    1991 Acura Integra RS 403Honda

  8. #8
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    Default

    Originally posted by Ekliptix
    I think cold air = denser air = more air/fuel = lean

    but don't efi's keep the a/f ratio constant?
    I what I wrote it right, it makes sense to use more fuel in colder weather because the air would be denser, but the a/f ration would be the same.
    Fuel doesent change states as easily (from a liquid to a gas) at colder temperatures, therefore you have to add much more fuel with a cold engine. Heat is tranfered from the engine components as the engine gets warmer, requiring less fuel.
    a/f ratios are constantly changing depending on engine coolant temp (ect) air charge temperature (act), load, rpm, barometric pressure and many others.
    Part throttle and idle with a warm engine should see a/f ratios of 14.64:1 properly tuned.
    FYI, You CANNOT burn gasoline in a liquid state.

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