Speedometer Error
I recently put new tires on my 2001. I used the exact same size as the originals.
On a recent road trip with a friend I seemed to always have to go faster than he was to keep up. This lead to a speedometer check on a true measured mile several times, plus a GPS reading. Each showed a speedo reading of 80 mph to be a true speed of 77 mph. That'll rack up some odometer miles huh? I have never tested the speedo previously. So, not certain if this SOP for the Boxster or the result of new tires. The only thing different on the new tires is going from a summer tires to an all weather tires. Tire Rack says that shouldn't make that much difference.
Grasping at straws, could I be so lucky as to discover a black box adjustment for correction?
Dusty
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