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The Odometer gives you distance based on the number of revolutions the tire makes. If it is calibrated wrong, it will display the wrong distance.

Exactly to your point, if you do the math, from the 32.8 inch diameter tires RR's come from factory, I would need 34.4 inch tires to be closer to the actual mileage. When you went from 31 to 33, your vehicle now needs less tire revolutions to cover the same distance due to the larger...

This is the first time I've had such a big discrepancy. On road trips, I need to set cruise control 5kph over my desired travel speed

When the speedo is out of calibration, you not only get an erroneous speed measurement, you also get a bad mileage record. It can go either way, where in my case, I may be only traveling 1000 geographical miles, but the car will have 1,050 miles on the odometer. That means that at 100,000 miles...

That is the only upside to this situation. My biggest concern is that I am racking up the mileage at a 5% higher rate than what I am actually traveling

Mine is off by 3mph @60

Hi, I live in Mexico and have a Thailand built ROW 24 Ranger Raptor. Has anyone else experienced a noticeable speed discrepancy? I have verified it several ways. Pacing my wives 23 Navigator, GPS and chronograph. All three methods give me about a 5% discrepancy. If my speedo says 100 kph, I'm...