Wow, have you guys got it good; currently petrol/diesel prices in our part of Scotland run at £1.21 a litre - equivalent to £5.50 for an imperial gallon.
Because UK gallons are larger than US gallons (ok, we have to occasionally redress the balance, LOL) the price for a US gallon in the UK would be £4.58, which is approximately $6.82 at the current rate of exchange. Unless our new government does away with the tax measures imposed by the last one (and I can't see them doing this for fuel!), the next year has another couple of tax rises built in to the price, whatever the real cost of the fuel.
Here's an article on fuel taxation in the UK
http://www.petrolprices.com/fuel-tax.html
Margaret