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60 highway miles will put just at 67 miles on the odometer!
My spedo is always 10-12 percent high. This is also true for the odometer. My 1999 996 has 18,459 miles, but as much as 2,215 are overstated. What can I do to fix this for the future? It is a pain to always figure 10% and guess at my speed. Thanks for any help!