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...or, if you want to "calculate" for yourself:
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.
_60 = constant, minutes-per-hour
__G = transmission gear ratio, ie: 1.01:1, etc.
__A = axle ratio, ie: 3.55:1, etc.
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