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I would like to know what effect that has on the odometer.



According to my GPS, my speedo was running fast (as everyone elses seems to) but the odo ran slow (long). So if the GPS said 100 miles, the odo was at 95 or so. Seems like if the speedo were running fast, the miles would run short rather than long, but not so in my case. That works out OK if your running for a minimum measured distance, rather than running fast/short like most Jap speedos tend to do.