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I got this tip off of Wayne Gerdes, but he opens the driver window 1 inch (ish) and the rear passenger window 1 inch (ish) and it creates a nice cross draft without any noticeable effect on aerodynamics. I use this technique and find it works quite well at moderate or high speeds. If you're stuck in bumper to bumper traffic and very low speeds you mine as well roll your windows down all of the way because aero will be fairly irrelevant. I never use the A/C or fans because of redpoint5's points.
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