I got a speedometer, I'm not going o say who I got it from because that wouldn't be fair and it's irrelevant anyway...but anywho, i was driving along next to my uncle's car, my speedometer said 25 and he said his said 20, and we were going the same speed. So does this mean that whatever speed i'm going, I decreas it by 20% to make it actual speed? I want to see if i can't get an officer to radar me just for the fu of it, but what are the chances of that? just on observation and a thought. So would this also mean that the odometer would also say more milage than actual?