There are 128 fluid ounces of any liquid in one gallon.
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1 gallon = 128 fluid ounces
There are 128 US ounces in a US liquid gallon or 160 UK ounces in an imperial gallon.
There are 128 fluid ounces in one gallon of water.
There are 64 fluid ounces in a half gallon of water.
1 gallon = 128 fluid ounces,regardless of whether it's a gallon of water, beer, mud, or air, or an empty gallon.