You have a point. There is no doubt that we will switch to a VMT tax at some point. When ICE powered cars are in a minority the gas tax will make no sense. What is needed is a reasonably fool proof and cheat free way of measuring the miles traveled without raising the fears of the conspiracy theorists. In other words miles traveled must be measured without location tracking. Perhaps this could be done by measuring position every minute and comparing location with the previous minute, but only storing the last two locations and the total miles traveled.

We shall see. Experiments are already underway.