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    In an average motor car, in what circumstances is driving with the windows open less economical than driving with the windows shut and the air conditioning on?

    Question #59115. Asked by gmackematix. (Aug 31 05 6:53 PM)


    daddy1161992

    		on the highway, the added wind resistance of having the windows open, negates the amount of gas used by the air conditioner.

    Aug 31 05, 8:11 PM
    gmackematix

    		You have the gist of why but according to what I read recently, it isn't true at all speeds.

    Sep 01 05, 10:18 AM
    NEfromNY

    		So that means you have to be going at least a certain speed?

    Sep 03 05, 7:25 PM
    daddy1161992

    		I wasn't sure of the speed, but I think it's 45 mph, when wind resistance negates the fuel used by the a.c.,also on the subject of mpg, wind resistance goes up exponentially with speed.

    Sep 11 05, 8:08 PM

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