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There are several issues. Some is wheel/tire improper size. Some is instrumentation error and some is simple calibration of the guage.
On my old BMW X5, if I read the ODB-II directly, it perfectly matched the GPS reading. But the dash guage read high.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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