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Originally Posted by merleniau
I think Mythbusters just did the "tailgate up/tailgate down" thing. You get better gas mileage tailgate up, because you create a "bubble" of air in the bed/behind the cab that almost acts like a cap. I don't remember them doing the same thing with/without a cap, but they did do windows down vs. AC.
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I think it was in a "viewer-requested follow-up" episode...