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Why do i get worse gas mileage in the winter with the AC off?

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Old Mar 3, 2009 | 02:47 PM
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From: Little Ferry, NJ
Why do i get worse gas mileage in the winter with the AC off?
has anyone noticed this? Isnt it supposed to be the other way around?
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Old Mar 3, 2009 | 02:57 PM
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maybe you drive harder in the winter
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Old Mar 3, 2009 | 02:59 PM
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From: somewhere testing various tires, brakes, and suspensions.
Oxygenated gas - aka winter blend.
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Old Mar 3, 2009 | 03:35 PM
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cuz it takes your engine longer to reach operating temp?
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Old Mar 3, 2009 | 04:11 PM
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From: Wheeling, WV
Good question, I've noticed the same thing with my 8. Denser air requires more fuel, maybe?
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Old Mar 3, 2009 | 04:18 PM
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The air is also more dense and requires more fuels.
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Old Mar 3, 2009 | 05:02 PM
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your car makes more power in the cold thus more fuel is being burned. Plus winter gas blows and you might be letting your car warm up which can eat gas.
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Old Mar 3, 2009 | 05:56 PM
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winter blend has more volatility to ignite in the cold weather, but less btu content and therefore less mpg.

I'm sure the other things like parasitics from thick as syrup gear oil don't help either.
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Old Mar 3, 2009 | 06:09 PM
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Im getting really bad gas mileage also
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Old Mar 3, 2009 | 06:12 PM
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Engine oil is one suspect.
I guess the huge thermal losses from engine to the surrouding has something to do too.
Thermodynamics.
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Old Mar 3, 2009 | 06:34 PM
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Does anyone notice that the cars run rougher on winter gas or is it me?

By the way as for gas mileage, if you run the defroster, I believe it might kick on the AC compressor as well, which in turn eats gas.
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Old Mar 3, 2009 | 06:37 PM
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cold starts and warming up the car...
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Old Mar 3, 2009 | 07:05 PM
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did you guys fill tires back up to spec?
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Old Mar 3, 2009 | 07:16 PM
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I've noticed around 1 - 2 mpg less in the winter. Is that similar to what you guys are getting?
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Old Mar 3, 2009 | 07:36 PM
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Yep about 2 MPG less in the winter. Pretty common.
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