Originally Posted by Hulk
I stopped tracking mileage a few months ago, since my speedo is significantly off. I'll use the GPS to track mileage out to the Rubithon and get some numbers.
I recalibrate mine every year driving to Moab. When I pass milemarker 100 on I-70 I write down the odometer reading. Then when I cross the Utah State line I write down the odometer reading. The difference between odometer readings from 100 miles becomes my new correction factor. Using so many miles gives very good precision. But then, I don't have a GPS