I know, it sounds amazing, my '67 has a 30gal capacity which seems more reasonable, but I have now found reference to the 50gal capacity in two places in the brochure. Chances are that they downsized after printing the brochure. I have an idea, drain your tank, time how long it takes to fill a 3 gallon bucket with your hose (to get a gal/min flow rate of your outside plumbing), then time how long it takes to refill the fresh water tank. I'll bet that this will get you a fairly close approximation.
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