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My LP gas tank, when essentially† empty, weighs 17.82 pounds. When freshly filled by Metropolitan Tool Rental in Shelby Township it weighs 36.32 pounds. The TW (tare weight) stamp on the chime indicates that the empty tank should weigh 17 pounds.
I’m not sure if I’ll go to Metropolitan for another tank fill, as they seem to charge a fixed price for tank filling regardless of amount needed. I was getting one tank filled and another (which was about half empty) topped off, and I was initially told that there was a flat rate for filling any tanks. Asking them if it’d really be full price to have one tank partially filled they cut that price in half. Next time I’ll try and find a shop that simply charges by the quantity of fuel sold plus a base service charge or something.
† Essentially empty is defined as when the tank is empty enough that, while operating a turkey fryer burner for brewing beer, it would not produce a normal flame and thick frost was developing on the very bottom of the tank. Upon swirling the tank to warm the liquid the flame would return to normal size, but within a few minutes it would settle back town to a trickle. I’m presuming that the gas level was low enough that any evaporation (read: liquid turning to burnable vapor) was sufficiently chilling the remaining liquid so that it wouldn’t readily evaporate.