OK, stupid question time. I know that when you put large tires on, the speedometer shows less than what you are really going, i.e. it shows 65 and the radar gun shows 72, but what about the odometer. For example, if the odo reads 100 and you know you have a 7% difference in old and new tires, then is the "real" mileage 107 or 93? Kinda curious what my gas mileage is and can't keep straight if it is better or worse than I think.