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Go to flying jay truck stop. Drain fresh water. Run the MH across their scales and get empty weight. Use there water hose at RV island and fill water tank until it runs out overflow. Run across scales again and get loaded weight. Subtract empty weight from loaded weight. Divide this number by 8.35 and you have you gallons. Lets just say you have 835# of water. Divide by 8.35 and it looks like you have 100 gallons of water on board. My water weighs 668# so devided by 8.35, wow looks like I have 80 gallons fresh water on board!
thanks for the replies, where is my spec sheet? is it in the coach somewhere? I thought about timing how long it takes my hose to flow 5 gallons. Once I do that I can fill it and time the fill till full.