I thought about this as well.
If you are fortunate enough to have a solar array and local storage (charge house storage during the day and from that to car overnight) then it remains an increasing benefit. If you cannot then you will be in the same position as petrol is moving forwards, at the behest of the market. Petrol will no doubt become a bigger tax target as the mass volume of vehicles become BEV due to the UK goals. In theory the electric should translate to renewable and so become cheaper?
To add to Neilda's comment the running cost of the larger cars is becoming a LOT more expensive as garages continue to increase their per hour labour charge on ICE cars and they become more complex as they hit EU6 emissions capability? A big lump like my ML63 and a Range Rover eat brakes and tyres etc so I expect the re-gen and lack of moving parts should make a heck of a difference when you multiple the work by hourly charge for servicing. This will continue to increase as the car dealerchains come under pressure through the squeeze ahead.
I still think the more valuable thing is to reduce travel as far as possible (for work) in order to drop all costs. Petrol, servicing, road charges (soon), insurance, tyres, speeding tickets (oops) and ginsters at the petrol stop.
