I think the issue in question was that the gov’t would resist a switch over to a system which they couldn’t tax separately like they do with gasoline currently.
If you’re tapping off you house, even after the house meter, they would probably require a separate “car meter” in order to tax you for the gasoline tax equivalent (to maintain the roads).
Per mile road tax woulkd be my bet.
Anyway, FR is intollerably slow and I’ve got chores.