Energy required to move a vehicle is a function (mainly) of aerodynamics and weight. It matters little whether the energy source is electric or diesel/petrol. EVs may typically use a little more energy due to weight of batteries.
Generating and transmitting electricity consumes energy, but electric motors are very efficient in turning KW into motion. ICE are typically ~30-40% efficient in turning diesel/petrol into motion. Overall there may be little difference in overall efficiency or cost before tax.
The difference in local emissions is obvious. If all electricity were generated using fossil fuels, the impact of EVs would just be to shift emissions from point of use to generation. However increasing green energy means generation may use little or no fossil fuels.
I fully expect road pricing to follow. The transition to EV seems entirely sensible and inevitable. IMHO it is not a way to transfer wealth from the poor to the already wealthy - without initial favourable tax treatment it would never happen.
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