The rule gets you in the ballpark. Rolling resistance and drag forces are generally about equal at 35-40 mph for more blocky vehicles and around 45-50 mph for more aerodynamic ones, both depending on vehicle weight. The rule can then be made to work by using a sliding scale in speed since it ignores drag force - pick the speed at which it fits for a given vehicle. It fits my car at around 60 - 65 mph. It’s high by about 25% for my car at 45 mph, which is the speed at which the two forces are about equal.
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