If it helps, consider the cost of getting the charger installed as you like it over the savings you gain from much cheaper fuel. If you’ve a smart meter, Octopus Go costs 7p per kWh. Taking into account most cars return 3.5 miles per kWh (more in the summer potentially less in winter) then it costs 2p per mile.
If you estimate petrol costs £6 per gallon and you get 40miles from that gallon that’s 15p per mile.
If your install costs £700 and you’re saving 13p for every mile you drive, the charger install is paid for in 53,846 miles. Thats, 4years? Less if petrol costs much more than £6 per gallon.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark