I just measured the dimensions of mine, height, width, length. Multiply these 3 which gives you cubic feet, or cubic inches. Then google to convert cubic feet/inches to gallons.
Mine came out to:
Main fuel tank: 88x20.5x26" = 27 cu/ft= 202 gallons Auxilliary tank: 57x27x10" = 8.9 cu/ft= 67 gallons
269 gallons total
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