Gasoline price at your local area.

[JustinUK]

At my local station it's £1.04 for a litre.
3.8 litres in a US gallon gives £3.95 per gallon.

Tourist exchange rate on travelexmoney.co.uk is $2.1451=£1
So an American tourist can expect to pay $8.48 per gallon in the UK. Eek.