Change in tire size and ODO
I ran into the speedo problem when I bought my used Tundra with 75s instead of the normal 70s. When I was stopped for speeding, the officer had me going 5 mph more than my speedo read. I had my wife pace me in our Toyota van and confirmed that my speedo readout was 5 mph too low. I checked with the dealer, and they told me Toyota has a margin of error of up to 7mph, so they could not (or would not) recalibrate the speedo.
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