Re: speedo question
If you have a nearby road with milemarkers you can drive between markers to figure out how far off the speedometer is. If you drive two miles and the odometer registers 1.5 miles then speedometer reading is low by 1.5/2 or 75%. I used to make charts for people that listed speedometer reading and actual speed. Guys would tape them to the dash instead of paying to fix the speedometer.
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