



 
Dear G., One imperial gallon is about 277.42 cubic inches. Your tank holds approximately 70 × 48 × 24 = 80,640 cubic inches. That's approximately 80.640/277.42 = 290.7 imperial gallons. I say approximately because those may be the inside or outside dimensions of the tank (if they are the outside dimensions then the inside dimensions are less because of the thickness of the tank material), and because the corners may not be square. Victoria  


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