It's a bit of a twist and turn making like for like comparisons as the US Gallon is smaller than the Imperial (UK) Gallon.
I drive a diesel engined vehicle with diesel costing an average £1.3638 per litre according to http://www.petrolprices.com/
After several conversions that's $10.085 per UK gallon or $8.39 per US Gallon.
Most of which is UK fuel duty and VAT both of which have been raised by the UK Government recently by way of revenue generation (and supposed "green" disincentives to discourage fuel use and encourage alternate transport and lifestyle choices).
There is a growing lobby to get the government to review the loading of tax as the real price of oil is forced up by world demand as it is having a disproportionate effect on business.
There is talk of a fuel escalator formula that would stabilise the price at a fixed level by reducing tax levies as world oil prices rise - so long as we accept increased taxes again if oil prices fall.
Some way to go on that debate though.