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I jumped up one tire size from stock on my 2006 Chevy 2500 and since then my hand calc'ed mileage is within 1 thenth of the DIC and magically the speedo is spot on, thats been confirmed by both GPS AND calibrated Radar. My 2004 Ford also read about 6mph faster than actual speed. Do they do that to end the warranty period faster than actual? I seem to recall talk of some sort of lawsuit about this a while back.
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