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1 gal Imp. = 1.2 gal
1 gal = 0.83 gal Imp.
Definition of U.K. gallons of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).
Definition of US gallon of water provided by WikiPedia
the US gallon is defined as 231 cubic inches (3.785 l), which is used in the US and some Latin American and Caribbean countries