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Old 06-26-2012, 06:56 PM   #21
jrblackman
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Join Date: Apr 2012
Location: Mid-Michigan
Posts: 89
Garage
speedometer variance

After reading this thread earlier today I installed GPS Essentials on my phone and compared the GPS reading with both cars. The Boxster is consistently 3mph over the GPS reading; while my Impreza is in the range of 1-2 mph over the GPS. So I guess I can set the cruise slightly higher when driving at police officer friendly speeds.
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