Comparing ICE with EV costs is fraught. Many simply select those that best fit a preconceived notion.
Electricity costs between zero and 80p per KWH depending on whether it is fast charged at premium rate or direct from a home PV installation. Mile per KW will vary between 3 and 5 depending on the size and use of vehicle.
ICE does not suffer price variability - diesel or petrol typically £1.30-1.40 per litre. MPG again depends on size of vehicle and usage - somewhere between 30-60 mpg would be typical.
To make sense of comparative costs for a mid size hatchback:
- assume cheap rate electricity costs at home are 10p per KWH - the price cap is currently 22p
- assume petrol and diesel at £1.35 per litre
- assume commercial recharging is 60p per KWH
- assume 4 miles per kwh, and 45 mpg (10 miles per litre)
Per 1000 miles - EV wholly charged at home = £25, EV charged wholly at commercial recharging points £150, ICE = £135. What this demonstrates is that it all depends on use and the ability to home charge.
Making it rather more personal - I am looking for a new car and EV is an option. I do about 10000 miles pa of which I estimate 7000 could be home charged. 3000 on longer journeys would incur commercial rates. Resulting fuel cost - EV = £625, ICE = £1350
Saving £625 pa is non-trivial, but about the same as an extra tank of fuel each month so hardly disastrous. Put into context - if bought said car for (say) £25k it will depreciate ~£3k pa. If on PCP contract the monthly payments will be £3-400 per month.
For me the jury is out - I still have some range anxiety (quite possibly illusory), the fuel saving is nice to have but not the largest motoring expense, EV technology is advancing at pace raising the possibility of early obsolescence and/or limited spares availability.