Drained our fresh water tank completely and refilled using a reasonably accurate in-line flow gauge (calibrated with 5 gal bucket +/- .07 gal/5 gal bucket)= 63 gallons and water started coming out vent. Water continued coming out vent slowly for approx another 5 gallons. Convenience Center gauges: fresh water empty when empty and empty when full. One hour later fresh water reads full when full- about as accurate as the rest of the gauges.... Maybe fresh tank is indeed 80+ gals but vent is located too low-don't have clue and that's close enough for my minimal boondocking.
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