Quote:
Originally Posted by alero168
yeah warming up your car and using more electronic stuff like your front and rear defrosters. all these things make the engine work harder. so in spring when youre rolling down the windows you should probably have the best mileage. idk.
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they tested that on myth busters... and the wind drag that having the windows rolled down causes as much fuel mileage drop as if you had the AC on and the windows up...