ugh, thats retarded. not to mention people that will learn how to tamper with the onboard gps to alter the read mileage, itll create one hell of a headache. and also, who decides on how much the tax will be? will it apply to semi-truck drivers, etc. and what about college students or anyone for that matter that has little money to spare. but like grifter said, if it happens it will be a while, in which i still think its a retarded idea