why does gas mileage decrease during winter? - Page 2 - Mercedes-Benz Forum

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post #11 of 18 (permalink) Old 01-03-2007, 05:38 PM
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Change in gas formulations, but also since the air is denser when it's colder, there is more oxygen so the car will then add more gas (assuming you have electronic injection).
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post #12 of 18 (permalink) Old 01-03-2007, 06:34 PM
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Thumbs up Canadian_Yeti

Quote:
Originally Posted by Canadian_Yeti
This was taken from an online source:
Good article, thank you.

BTW, I was only guessing aka "shooting from the hip" but I mentioned a richer fuel/air mixture earlier

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post #13 of 18 (permalink) Old 01-03-2007, 06:37 PM
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Question Spiking w/ethanol

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Originally Posted by lkchris
If your area spikes gasoline with ethanol during the winter, this will decrease fuel mileage.
Do you know what this is supposed to accomplish Kent?

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post #14 of 18 (permalink) Old 01-03-2007, 09:39 PM
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Smog reduction, ethanol addative

To increase oxygenation to more fully burn the fuel, reducing smog.

I have lost about 2-3 miles per gallon.
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post #15 of 18 (permalink) Old 01-04-2007, 09:01 AM
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Thumbs down Reformulated gasoline

Quote:
Originally Posted by billkirn
To increase oxygenation to more fully burn the fuel, reducing smog. I have lost about 2-3 miles per gallon.
I spend some time in Louisville, Kentucky and was warned about their government-mandated fuel that they call "reformulated". I Googled it, and found an EPA article about this stuff. It didn't go much into the science of it, but essentially said what billkirn did here - increasing the burning efficiency and reducing smog. They use it all year long there, but I don't know if they change it seasonally.

I should add that this is supposedly used in other major metropolitan areas, and I think they must have mentioned Los Angeles, New York City, and so on.

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post #16 of 18 (permalink) Old 01-04-2007, 10:12 AM
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And of course in places like Nebraska and Iowa to appease farmers.

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post #17 of 18 (permalink) Old 01-04-2007, 10:46 AM
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I have never noticed any difference in gas milage from season to season.

Don't believe everything you think
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post #18 of 18 (permalink) Old 01-04-2007, 11:23 AM
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LeChatlier's Principle:

I know this is a basic equation, but it will illustrate the point.

C8H14 + O2 --> CO2 + H2O + Heat

When heat is removed (as in moving it from the engine compartment to the passengers car), the reaction is driven to the right in order to replace the decreased/missing component. This means the reactants will be consumed at a higher rate including the octane....therefore more gasoline is used when running the heater.

Mike
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