I just started weighing my gas canisters and writing the weight on the can so I know how much is left. As soon as I have an empty one I'll have a good base # to know how many oz. are left in a tank.

I've had one of those Olicamp pots for a while. You'll want a stove with a fairly small diameter burner so the flame goes inside the base of the heat transfer ring. My old stoves flame hit the bottom of the outer ring of the base and a lot of the flame went outside it and up the side of the pot If I cranked it too high.