Assuming that your tube has an INSIDE diameter of 3 inches, then the volume will be that of a cylinder. V = (pi)r2h = 3.14159x(1.5)2x36 = 254.46879 cubic inches
231 cubic inches = 1 gallon, so divide, 254.46879 / 231 = 1.10159649 round to 1.1 gallons
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179.52
179.53 gallons
3961
a gallon is 231 cubic inches, so: 36x16x6.5 / 231 = 16.2 gallons
Volume of that space is 36" x 17" x 12" = 7,344 = 31.79gallons