Electric cars cost as little as 2 pence per mile if you charge your car at home on an ordinary electricity tariff. You can get the cost down to about 1 pence per mile if you have an electric car utility tariff where you set the timer on your car to charge during off-peak hours. If you have solar panels, it will almost certainly cost even less. If you're using public chargers then the cost will be around 5 pence per mile as the price per kilowatt will be double that of home energy.