I do the Man maths on these things to suit whatever result I want to get
but I don't think a Prius is a reasonable range comparison for a Model-S
Perhaps 30 MPG would be more reasonable for a price comparison?
Two ways to look at that. Whilst higher taxes may not be popular it raises revenue and encourages people to use less - switch to more efficient / smaller / whatever cars, share, drive less, and so on.
The thing I find disappointing is that USA has not also raised taxes on Gas similarly, and used the money to likewise encourage people to use less, as well as pump-priming the transition to new/green tech.
USA is now a net oil exporter again, with the adoption of Fracking, but during the in between period imports were expensive both for balance-of-payments and the cost of going to war. Perhaps higher taxes would have reduced consumption enough to mitigated ...
I wish we had used the windfall from our North Sea Oil revenue for a Sovereign Wealth Fund, as Norway has done.