Registration and Posting Agreement
My speedo is off by about 5mph (AT 70MPH.) at 35MPH it's correct. I have checked this through local police and their radar guns. (some are friends and will let me use them to test this)
reminds me of a cop around here had a guy ask him if he could see how fast he was going. the cop said yes, so the guy pretty much does a quarter mile run by the cop. the cop pulls him over and gives him a ticket for speeding. the cop never said he could speed just he would tell him how fast he was going lol