Why not do it on jack stands in your clean, cool garage? With the car on the
floor, measure from the centerline of the axel to the floor because of squat
or footprint. That radius should be slightly different (shorter) than the
top radius. Use the shorter radius to find circumference. Then divide by
5,280 or any subset of 1 mile by your result. Chalk the tire and count the
turns. This method may be more accurate than towing since you might not
travel a straight line between the mile markers. Since towing would be at a
slow speed, tire growth would not be a factor just as the method I
described.
14 inch squat radius x 2 pi = 87.96 in / 12 in = 7.33 ft. circumference.
5,280/7.33 = 720 turns which are too many to count. 1/4 mile (1320 ft) would
only be 180 wheel revolutions. -Elon
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