I don't know how accurate the speedo in the TC may be, but overreading is a great feature for manufacturers . . . it makes the car look quicker, more fuel efficient, and more reliable (racks up miles more quickly.)
He could just get a good estimate with math . . . he knows his engine rpm and could look up the gearing and then make a couple of estimates for different tire diameters (as it varies a bit at speed) and I'm sure he'd atleast get a good idea of how accurate his reading was.
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