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Interesting. My Boxster always shows faster, which is apparently quite common. I set my cruise at 105 km/h which actually means I am going about 98 km/h. I don't think 16 vs 17 tires would make any difference. Something isn't calibrated right. Get a buddy to ride behind you and track his speed....see if it's your car or your gps.
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2011 Boxster 987.2 Arctic silver / Black leather, PDK with Sports Chrono Package Plus
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