There are 231 cubic inches to the gallon. So a 7.5-8" tall x 24" wide by 60" long is 40 something gallons on the potter hulls, maybe as much as 47, but replacements are often 10% smaller (mine was), depending on air volume and height. In that space, there was room to push forward at about an additional 8-9 gallons per foot.
Very roughly, 5 feet long is under 50 gallons and 8 feet long is under 80. Not sure that ratio would hold on a later boat- a taller tank under a raised deck could hold lots more per foot of length.
Or you can do the math, if you can measure it accurately.
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