That is just 1p less per mile for a petrol car, based on someone driving at an average of 40 miles to the gallon, the motoring group said.
The cost per mile for charging electric vehicles at home is around 9p per mile for the average-sized car. The BBC has been told most EV drivers charge at home overnight."
https://www.bbc.co.uk/news/business-63029226
64p per kWh vs £1.90 per litre looks like parity between the two ~3 kWh ~= 1 litre petrol a fair estimate (~11 kWh ~= 1 us gallon)? Obviously your mileage may vary.