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...for the numerically-inclined:
MPH = [ 60 / (G×A) ]×[ RPM/rpm ]
...where:
MPH = vehicle speed, miles-per-hour
RPM = engine speed, revolutions-per-minute
rpm = tire speed, revolutions-per-mile <--get this from your tire dealership
60 = conversion constant, minutes-per-hour
G = transmission GEAR ratio, ie: 1.00:1 <--usually highest gear
A = transmission AXLE ratio, ie: 3.91:1
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