mileage
The big thing is intent. If you want to falsify the mileage, it's a problem. If, like in Fla, there's the little box you check that indicates the mileage shown is either unknown, exceeds limits, or some other- don't know, then you're not trying to cheat the system. I've reset mine several times due to- broken speedo, broken cable, stripped worm gear, and other failures. I keep track of how much I drive and try to set it according to what I've put on it- 370,000 miles (rolled over the 70,000 tonite) and, since it'll never be sold in my lifetime, who cares what it shows!
Actually, resetting the odometer isn't that hard, you just need to know how it's done so the numbers line up correctly. I think I'm on the 4th or 5th odometer (keep wearing them out!).