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Your speedometer is lying, but is GPS accuracy actually any better?

Modern cars surround drivers with digital certainty, yet one of the most basic numbers on the dashboard is quietly biased in ...
La Crosse Tribune

Does tire pressure affect speedometer or odometer readings?

Yes, but just a bit. A car measures the rotations of the axle and wheel. The speed is the distance traveled per hour (speedometer reading). The distance traveled (odometer reading) is rotations ...