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This would depend on the density of the fluid involved.

Ounces are a measure of Weight wheras Gallons are a measure of Volume.

For pure water 4 oz are one fifth of a pint (20oz) therfore as there are 8 pints in an imperial gallon (not US gallon) therefore 4 oz is 1/40 th. or 2.5% of a gallon.

For other fluids this would be reduced or increased by dividing by the relative density.

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16y ago

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