Substitute the word "propane" for "water" and you're closer to fact.

Christopher A. Young
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""__ Bøb __"" wrote in message
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WHERE in the US does water weigh 4.2$/gallon ??? Mine weighs the world
accepted standard of ~8#/gallon.


That is 5.7 gallons US - and at 80% that is 4.56 gallons
At 4.2 lbs per gallon US, that is a total of 19.152 lbs.
20 lbs of propane would be 4.76 US gallons. If the tare weight of the
tank (in this case 16.6 lbs) is added you get a full weight of 35.72
lbs.