128 in US gallon; 160 in Imperial gallon - an Imperial gallon is larger, but the ounces aren't the same size
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There are 128 fluid ounces in one US gallon.
There are 128 fluid ounces in 1 US gallon. There are 160 fluid ounces in 1 UK gallon.
0.01 ounce
One fluid ounce equates to 0.0078125 gallon.
There are 9 fluid ounces in 1/18th of a gallon. To calculate this, you would first find how many fluid ounces are in a gallon (128 oz) and then divide by 18.