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For those who are interested ... Mythbusters tested the windows down vs AC thing and found that running the AC with windows up is much better than no AC and windows down. While I don't agree with Mythbusters on many of their techniques (sometimes they don't use scientific method) I do agree on this one as their science was sound.
Another was with pickups, its best to have the tailgate closed and not use one of those nets or leave the gate open as the truck is designed to have better air flow when air cycles in the bed. I remember they used a bed cover as well and if memory serves even that hurt gas mileage. This does not include boat tails however.
just my 3 cents
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