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1 fl-oz = 0.0078 gal
1 gal = 128 fl-oz
Definition of US fluid ounces of water provided by WikiPedia
One US fluid ounce is 1⁄16 of a US pint, 1⁄32 of a US quart, and 1⁄128 of a US gallon. The teaspoon, tablespoon, and cup are defined in terms of a fluid ounce as 1⁄6, 1⁄2, and 8 fluid ounces. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, but in the US it is defined as 1⁄128 of a US gallon. Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois.
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