Because the Imperial system was based on all sorts of weird multiples.
1 gallon = 4 quarts
1 quart = 2 pints
1 pint = 16 fluid ounces.
So 1 gallon = 4*2*16 = 128 fl oz.
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1 ounce.
1 US gallon = 128 US fluid ounces
1536
No. Two thirty-two ounce containers equal 64 ounces, which is a half-gallon. It takes 128 ounces to make a gallon.
128 fluid ounces = 1 gallon 117 fluid ounces = 0.9141 gallon (rounded)