Quote:
Originally Posted by jd10013
yes, but that was only at speeds over 50. the first time they did it they kept the speed low, like 25 or something, so the tires wouldn't wear as bad. and that result showed no change in MPG. the second time they did it (because a lot of people wrote in making note of the speed) they ratcheted the speed up and it did in fact show a decrease in MPG with the windows down.
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I think they concluded that below ~45mph it's better to keep windows down and ac off. Above 45 they said ac on and windows up is more efficient. But I think the results were so negligible it was easily within the statistical error margin, ie do what ever you want.
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