1 Gallon = 128 fluid ounces (volume not weight)
That's a US gallon.
An Imperial gallon is 160 ounces, but the ounces aren't the same size as US ounces. Nevertheless, an Imperial gallon is larger.
Using litres and millilitres to measure volume solves this confusion. (Of course the US doesn't use Imperial gallons, but here in Canada we did prior to going metric.)
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1 US gallon equals 128 fluid ounces
1 Imperial gallon = 160 Imperial fluid ounces
1 US gallon equals 128 fluid ounces
1 Imperial gallon = 160 Imperial fluid ounces
There are 128 ounces in a gallon.
16 8-ounce servings per gallon. (1 gallon is 128 fl oz.)
There are approximately 85 three-ounce scoops in a gallon of ice cream.
64
There are 64 ounces in half a gallon.