I really am not keen on the government putting a tracking device on my car. I understand why the traditional method of accomplishing this goal--a gasoline tax--is getting more complicated now that a lot of people are buying electric and hybrid vehicles. But there is already a method available that is plenty cheap, and does not have the civil liberties threat of adding more equipment to our cars: assess the tax every year by seeing how many miles are on the odometer. Perhaps have this be part of getting your registration renewed.
It would still be a nuisance, and really gives us another clue that the whole "green" delusion is a mistake, but it makes more sense than giving Washington one more way to keep track of who is going where.