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GPS speed should be pretty spot on. The speedo with factory size tires and wheels will reed a little low. In both my Boxster and our 996, the speedo reads around 3 mph fast.
I thinking it as my safety margin when driving fast. Probably saved me from a ticket or two
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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