The cost per mile for ICE is ~20p per mile assuming £9 per gallon and 45mpg.
The cost for electric is ~9p per mile based on 28p per kwh (more at fast charge privately operated locations) and 3-4 miles per kw.
The difference crudely makes sense - about half the price at the forecourt is VAT and duty.
Tax revenues from ICE will decline over the next 10-20 years until scrapped - most by 2040.
I would not expect tax on EV to be ratcheted up quickly - it would alienate existing EV owners, and reduce take up of new EVs.
At a guess - the framework and technology for taxing new vehicles sold will be put in place by 2024/5. New EV sold after that will initially have a tax of perhaps 2-4p tax per mile. This will increase progressively to ~5-7p by 2030, with a full rate of ~8-12p by 2033.
Does it matter - not much for most folk. Any purchasing decision only need have regard for the duration of ownership - typically 2-4 years. What happens after that is unimportant - any replacement need only reflect expectations at the time.
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