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Originally Posted by buckwheat
You said 68% in an earlier post, and 67.2% in a latter. That's pretty consistent.
You didn't mention speed accuracy. Is it obvious you're going 100/68, or 47% faster than everyone else? Are you watching your speedo while the car is supposedly not coming up to speed?
My guess is you put 18+" wheels and even larger OD tires on the car - when the speedo was originally calibrated for factory tires?
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67.2% is what I used as an average, since I measured as high as 68% and as low as 65.8%. But I figure if the percentages can swing by 2.2% just over a couple of days, who knows what it has been doing for the last month? Speedometer is 100% accurate with my wife following me in a brand new minivan. Stock 14" bundt rims with 205/70R14 Pirellis.