That converts to 8.82 kWh per litre, since this is about the UK.

Average petrol price is currently £1.50/L, so the figure is £0.17/kWh.

£0.17/kWh was a typical price a few years ago, but nowadays you'll only get that at night (with a suitable meter to measure time-of-day usage). Another comment claims 10p/kWh at night on a special tariff for EV owners.