It's about $8. The US gallon is smaller than the UK gallon.
At least I think ton and tonne are spelled differently. I'm American so can't say for sure.
The tonne is a metric measurement for 1000kg. American and UK tons are different amounts, but spelled the same way. They're known as short ton and long ton respectively. America also uses the long ton and the metric tonne for some applications without differentiating the names at all.
I don't know why we don't just switch over, I know engineers hate it.
Thanks for the info!
I assume the UK is the same as the US though where all Imperial units are now just derived from metric equivalents anyway. It's all deranged, welcome to the world.
Regardless, this site has prices in various countries in various volumetric units and currencies: