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1 tn long wt. = 268.41 gal
1 gal = 0.0037 tn long wt.
Definition of U.K. long tons of water provided by WikiPedia
The long ton arises from the traditional British measurement system: A long ton is 20 hundredweight, each of which is 8 stone, which is defined as 14 pounds. Thus a long ton is 20 × 8 × 14 lb = 2,240 lb.
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