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It can't be that big of a range since force slowing the car down changes from majority aerodynamic for 55+mph to majority rolling resistance below 25mph. You want to measure aero drag when it is the highest force(rolling resistance negligible) changing the velocity of the car, so maybe 65 to 50 or something, then subtract the rolling resistance using a coast down from 20 to 5 or something where areo is negligible.
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