1 gal (US) = 231 cu in 1 gal (imp) = 277.42 cu in
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There are 268.8 cubic inches in one dry gallon.
One US gallon = 231 cubic inches.
There are approximately 231 cubic inches in a gallon of oil.
1 US gallon = 231 cubic inches.
To convert cubic inches to gallons, divide the number of cubic inches by 231. This is because there are 231 cubic inches in 1 US gallon.