In reply to:

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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.

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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.