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Originally Posted by Thymeclock
you're probably better off having the windows up and the A/C on at highway speeds.
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It all depends. The wikipedia entry on the relevant 2005 mythbusters re-test of this idea concluded that:
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Going less than 50mph it is more efficient to leave the windows down, but going greater than 50mph it is more efficient to use the A/C.
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So yes. But there are other options than just windows all the way down or all the way up. I like my method best: I crack the windows just 1"-3" and sometimes also run the fan on lowest vent. I kick my shoes off.
With a small motor like a CRX 1300 or my 1.6, the AC definitely has an FE effect.