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Cold weather hurts FE many ways:
Greater air drag because of denser air (I remember 6% increase for 60F down to 30F)
Longer warm up time, so the fuel mixture stays richer longer
more resistance in bearings and tires because of low temperature
cold weather gasoline formula
greater electrical use: defrosters, lights, etc. (even A/C in defrost mode)
reduced traction, increased rolling resistance in ice and snow and slush and wet roads
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