Agreed. My point was its a variance that wasnt mentioned... either when comparing car speedometer to car speedometer side by side, or what one person said they had when compared to what another person had at X RPM. Add that to individual speedometer inaccuracy when compared to tachometer inaccuracy (KPro will show how far off your dash tachometer is), you have enough variance to equal about 7 or 8 mph when measured between several different cars.
Individually its not a lot... when compared between several different inaccurate setups it can be a good amount. A radar gun would be most accurate.
I wish i knew a solid way to know without visual inspection if you were screwed or not on the gears. : (
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