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Another way to get a quick estimate is volume in cubic feet times 7.5 gallons per cubic foot. I can usually do it in my head and am within fractions of a gallon of the real number in a very large tank. No way I can multiply out the larger numbers of cubic inches to divide by 231 but that is closer to the accurate answer.
 

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Discussion Starter #4
Thanks. Just wanted to verify that it was the size I remember. I have a shed full of empty ones and it is hard to keep track.
 
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