On Jul 3, 9:08*am, "jack" wrote:
The barbeque sized ones; about how much are they full and empty?

If it really matters, the next time you have an empty tank, take the
bathroom scale outside and set the tank on the scale. When you fill
it, weigh it again. If your scale won't function at that low weight
step on the scale holding the tank, subtract your weight from the
reading, repeat with filled tank. HTH

Joe