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I've improved the aero on my car a little (not enough, obviously), but the sweet spot for me should be 55-57 mph at this point. I rarely have a chance to cruise at that those speeds on level ground, since the freeway speeds here are typically 65-70 mph. What I have found is that the difference between 65 and 75 mph is ~ 4-5 mpg (17% difference).
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