said by robbin:
Can you find anything to back up their claim that 17 pounds is the correct fill for "safety reasons and laws"?
It's purely economic as NFPA 58 allows a 20 pound cylinder to be filled with 20 pounds of propane.
Down here if I take my tank to an AmeriGas filling location and am serviced by a guy who has a clue, he will fill the cylinder with 20 pounds of propane, if he understands to add 4 or 5 pounds to the total weight needed to compensate for the weight of the filling valve. Conversely if I exchange my cylinder at an AmeriGas exchange location I will get a tank back with 15 pounds of propane in it.
With exchange you are getting easy propane based on a per tank price and depending on local propane prices that can be quite a rip
Now propane exchanges do provide a useful service, they are a great place to dump out of date non-ODP tanks in exchange for in-date OPD equipped partially filled tanks.
Madness takes its toll, please have exact change ready