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I just always say 45-50 is the magic aero number of when it matters. Sure you can measure above 35 mph like for tuft testing and stuff, but a lot of tests show that 45 is when rolling resistance and aero are the same load. So 45 for an average car, and 50 mph for a more aero car. If I’m hypermiling to the super max, I try to stay around 50. Sure 45 may give a few extra mpg, but it’s diminishing returns
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