In reply to:
If I were I gas station proprietor and put up a sign that said I was selling gas for $1.159 a gallon and then had small print at the bottom of the sign that said ``Oh, by the way, that's a UK gallon'', I'd have to say that that was tantamount to lying.
However, assuming your in the US, having it being a UK gallon is better for you, so you wouldn't complain. Remember a UK gallon is quite a bit larger than it's US version.
A UK fluid oz is 4% bigger then it's US equiv.
A UK pint has 20 fluid oz, where the US has 16.
Both have 8 pints.