Rod,
Yes, a tad of speculation, but not regarding the size of the tank (which I was reasonably sure of) - only why some clerk made the error, the true reason for which we will probably never know.
The Australian Contract Demand for 120 of C60X chassis in CKD form included 'Gas tanks, external measurements 13.5 inches x 12 inches x 40 inches' which converts to a volume of around 28 gallons. Take out the rounded corners, recessed ends, wall thickness, etc and its still closer to 21 gallons than 12 (or 12.5 gallons).
Mike C
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