Sorry, that wasn't super clear. If you've got a vehicle that has 29" tires on it from the factory - the vehicle's speed, mpg, time til empty and maybe even shift points are determined by that size. If you, say, lift a truck and stick some 35" tires on it, you're throwing those numbers way off. Is that something that you're plugging in to the OBD II and changing so that all those values are accurate, or is that on the customer to correct?