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I didn't see it, but, how fast were they driving? I would guess that above, say, 50mph the aero drag of open windows is greater than the hp drag of an a/c unit. Guess this test might bear that out.
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1976 914 2.0
2000 Boxster 2.7 (sold)
1978 911 SC (sold)
1970 914 w/2056 (sold)
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