It depends on if you are using U.S. or Imperial form of an ounce, really. One Imperial ounce is 1/160th of a gallon and one U.S. ounce is 1/128th of a gallon. Take the U.S. ounce for example, and basic fraction math will state that it takes 128 ounces to form one gallon. Multiply this by 2 and you get your answer of 256 ounces.
Long answer short: 256 U.S. ounces or 320 Imperial ounces.
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256 ounces. 1 gallon makes 128 ounces and 1 ounce is 0.0078 gallon in U.S measure. There are 8 ounces in a cup, 2 cups in a pint, 2 pints in a quart and 4 quarts in a gallon. That makes 128 ounces in a gallon US. In UK 20 ounces to the pint, 8 pints to the gallon which makes 160 ounces Imrerial measure.
An ounce is a unit of mass. A gallon is a unit of capacity. The two units are therefore incompatible.
A fluid ounce, however, is a unit of volume, and 2 gallons is 256 fluid ounces.
One gallon is equivalent to 128 ounces. So, two gallons would be equal to 256 ounces.
There are 16 cups in a gallon, so 2 gallons is equal to 32 cups. Since there are 8 fluid ounces in a cup, 2 gallons is equal to 256 fluid ounces. Therefore, 21.33 cans of 12 ounce soda would equal 2 gallons.
There are 256 ounces in 2 gallons.
300 ounces = 3 1/3 gallons Three and one-third gallons
* US1 US gallon = 128 fluid ounces [US]Therefore, 2 US gallons = 256 fluid ounces* UK1 UK gallon = 160 fluid ounces [UK]Therefore, 2 UK gallons = 320 fluid ounces