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Ah, thanks to Bearleener's "back of the envelope" calculations I can see we're talking a bit more than 10% of 20% here, but not by much. The "wind tunnel" thread talks about how, at a constant 60 mph, a reduction in Cd of .01 is the equivalent of removing 220 pounds from the car. I would expect that figure to exceed 300 pounds at a constant 70 mph, and nothing I am doing to the interior is in that magnitude.