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Speedometer
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===United States=== Federal standards in the [[United States]] allow a maximum 5 mph error at a speed of 50 mph on speedometer readings for commercial vehicles.<ref>{{cite web|url= https://www.ecfr.gov/cgi-bin/retrieveECFR?gp=1&ty=HTML&h=L&mc=true&=PART&n=pt49.5.393#se49.5.393_182 |title=eCFR β Code of Federal Regulations |website=ecfr.gov |access-date=18 February 2019}}</ref> Aftermarket modifications, such as different tire and wheel sizes or different differential gearing, can cause speedometer inaccuracy.
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