inaccurate speedometer
My GPS says I'm doing 70, but my Boxster says I'm doing 75 (5 mph difference). Is there a way to have it calibrated?
The tires are Pirelli Pzero 205/50 ZR-17 on the front, and 255/40 ZR-17 on the back. I feel pretty sure these rims are original stock 17 inch.
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