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My record is still perfect...I haven't turned on the AC yet in my car. Having the windows down doesn't seem to make a great deal of difference at 60 mph (hard to be sure, since there are a lot of hills, so I only go by average, not instant mpg, and I rarely drive exactly the same route twice). With windows up, I estimate the difference between 60 and 72 mph to be about 10 mpg (60 vs. 50mpg) That's really where drag begins to show.
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