[blam]

"A gallon of propane is around four lbs."

Okay, thanks

So...one of those tanks is about five gallons so that means 20 pounds is five gallons which equals $1.80 a gallon.

It's been a while since I've gone there...I expect it's gone up some now.

[DuncanWaring]

Except that it will be very rare that you actually get five gallons in one of those canisters.

Starting with an empty one, you’ll generally hit “full” at around 4.5 gallons.