Quote:
Originally Posted by The Radium King
it's a known issue with the boxster that the speedo can read up to 10% higher than actual.
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That, of course, depends on the speed you are doing. Mine is off 3 mph based on many GPS comparisons. At 50 mph - that's 6%, but at 100 mph it's only 3%. Since I'm generally between 80 & 85 mph on the highway, mine is therefore off .03529%. Certainly not enough to worry about.