Quote:
Originally posted by Tanick
For what its worth, my GPS reads 80mph when my car reads 80mph. When my speedo reads 120mph, GPS reads 109mph.
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My stock 85 Carrera reads 80mph on the speedo, 72mph on the GPS. This ratio is consistant at higher and lower speeds. That's a 10% error.
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Ken Justice
1985 Carrera (Ruby II)
1973.5 911T CIS (Ruby, gone but not forgotten)
2004 Buell Lightning (aka Elbow-Crusher, crashed)
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