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Surprise MPG increase with tonneau cover

Vaguely remember them adding a hard cover. Maybe not. :)
I loved Myth busters, I remember they did a windows vs. A/C mpg episode as well..... myth was busted, actually got better gas mileage with windows up and A/C on due to less drag.
 
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I loved Myth busters, I remember they did a windows vs. A/C mpg episode as well..... myth was busted, actually got better gas mileage with windows up and A/C on due to less drag.
Both of those episodes made Car & Driver. Thinking Don Sherman or PJ O'Rourke wrote it.
 

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