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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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"Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark."
— Henri-Frédéric Amiel
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