I was going to suggest a GPS as well, but I was beaten to the punch.
Here in Alberta, there are "odometer test" sections marked on some highways. It's a 10km stretch, with markers once every km. That and a stopwatch will let you find out just how accurate your speedo is.
Speed
- The Grinch
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- Location: Mt. Crumpet
One way is by installing a SpeadoHealer.Ok, so how do you adjust the speedo after you find out how much it's off by?