If you are referring to U.S.gallons then 1 US gal = 0.133681 cu.ft.
therefore 4000 US gal = 4000 x 0.133681 = 534.72 cu.ft. (rounded to two decimals).
Should the gallons be Imperial, then 1 Imp. gal = 0.160544 cu.ft.
4000 Imp. gal = 642.18 cu.ft. (rounded to two decimals).
An Imperial gallon is larger in volume than an US gallon by approximately 20%.
(1 Imperial gallon = 1.20095 U.S. gallons).
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