Re: Petrol provides more energy per £ than mains electricity
"UK average electricity cost is arond 18p/kWh"
Erm, and that has what to do with the price of fish?
There are two important rates for an EV driver:
- Your overnight rate (usually <10p)
- The service station rate (26p/kWh at PodPoint, 30p/kWh for Gridserve, up to 45p for InstaVolt). I'm ignoring ionity and tesla since they are mostly closed networks, or at least designed to be)
Those expensive rates convert to 6.5p/mile, 7.5p/mile, 11.25p/mile.
It is vanishingly rare that you would use any other rate.
And when you do use a service station charger, you are only doing so on the "second leg" and onwards of a long journey. I have a journey which is two complete charges of the battery in my car in the middle of winter, so two stops make it nice and easy (and coordinates rather well with loo breaks etc).
Start full, arrive empty - so we needed 1 full battery at service station rates. Recharge at destination, might that will take a couple of nights if you're limited to a three pin socket, then do the same on the way home.
That's then a "long journey" cost of <20p/kWh or 5p/mile.
Petrol at 50mpg will get you 13.2 miles for £1.45 (https://www.confused.com/petrol-prices) for 11p/mile (i.e. about the same as the rather expensive, but conveniently located, instavolt facilities).
If you get the cheapest in the country then you can save a penny... 9.8p/mile, up to a service station at 15p/mile.