We used to return our empty gas tanks for our BBQ grill to the local retail store and exchange for a new filled tank. Now, we just take out "empty" tank to the local propane company or to a local store that sells propane to fill our tank for us. Because it might not be completely empty and why give the remaining propane away. You'll conserving what you already have and unknowingly saving $$.
My husband found out that the local stores only have tanks with 18 pounds of propane and he was told the tank will hold 40 pounds of propane, so for a few dollars more you can fill the tank full at the local propane campany or check your local tool rental store. this saves you money two ways more propane in your tank and more gas in your car.
We were exchanging our tank before it was empty (we didn't know it, but it no longer worked so we assumed it was empty). We took it to the local truck rental place to get it refilled. When we told the guy it seemed like it emptied fast, he said there was probably a vapor lock in it and to unhook the tank from the grill (you will hear a woosh) and reattach it. You may have to do this for each of the next several times of use to unlock the vapors, but you will empty your tank and then refill it to the top (or exchange it).
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