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This issue seems to vary from car to car. I used a GPS with my car (Tip w/the optional 18's) and I found the GPS readings were no more than 1 to 2 mph lower than indicated by the speedo over a range from 40 to 90 mph.
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Paul B. Anders / Phoenix, AZ
1970 Porsche 914 / 2003 Porsche Boxster / 2009 Honda Fit Sport Auto
Last edited by pbanders; 06-04-2008 at 05:38 AM.
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