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Gallon is imperial measurement so there are 128 fl.oz. in a U.S. gallon.

There are 16 cups in a gallon and one cup is 8 fl.oz.

However, if you are referring to U.K. gallon then it changes.

Both have 8 pints of fluid but a U.K. pint is 20 oz and U.S. pint is 16 oz. which means a U.K. gallon is 160 fl. oz.

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13y ago

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