Charging per mile driven is an incredibly bad idea when done bluntly as proposed. I'll keep politics out of this. The whole proposed shift to EVs was supposidly about being green (I know, don't get me started on that one). The way fuel tax was added per liter was also ostensibly the same. Add to those two that road tax is based on CO2 output. So all the policies are taxing the heavier more polluting cars more, while lighter more efficient cars less. Now apply a per mile to all cars, yes there are proposals for higher brackets for vans and HGVs, and you have given zero incentive for manufacturers to produce more efficient cars or for the average consumer to look for efficiency. If you lump all cars into one category that would mean if I were to barrell down the motorway in a 5 ton behemoth (e.g. hummer EV, or for europe/UK their nearly 3 ton EV SUVs) or a sub 2 ton efficient EV I would pay the same per mile?! How stupid is that?