I can't speak to other states, but in PA, part of the logging is what miles you've driven through the state. This prevents drivers from stopping and filling up

I can't speak to other states, but in PA, part of the logging is what miles you've driven through the state. This prevents drivers from stopping and filling up on the border at a cheaper state and have enough diesel to drive through without buying more in our state. So the road tax is already based on mileage not just fuel. It is just partially charged at fuel purchase time. The main problem with EVs is that it would be easy to back charge you based on mileage but getting that $600 bill all at one time would be a hardship for some people. PA has an annual registration fee that also hits seniors quite hard as they drive almost no miles but at least they don't pay much in tax at the pump. fyi, PA is a great case study as we have more miles of road than any other state and the majority of shipping to/from the northeast goes through the keystone state. I think we'll have to be more innovative and split these into a monthly payment based on expected miles and you pay the balance at annual inspection/registration time. Then we can charge based on weight and mileage to get a more fair picture of use. [Source: my sister is a high level director at PennDOT.]