I've been doing some research on the fuel used to burn in a "pocket rocket" lightweight folding camping stove. I have a couple of different stoves, a Brunton, Giga Power, MSR, etc. They are defenetly NOT the same. Neither is the fuel. Brunton, Coleman, MSR, Giga, and a few other brands make the fuel vaguely described as IsoButane. Each brand has it's own makeup, but usually just a blend of two different gasses: Propane (LPG) and Butane (n-butane). Most seem to use a mix of 80% Propane and 20% butane. Some stoves are butane only, like some of the Brunton units. Most seem to be IsoButane fuelled, but only the larger and heavier burners can use straight propane. What I'd like to do is refill my little 4 or 6oz canisters. Usually they are considered disposable, for a single use only. I don't see why I can't refill the canisters like a scuba shop refills Nitrox tanks. They use pure O2 to a certain pressure, then fill them up the rest of the way with air. This loweres the amount of Nitrogen in the mix, and allows for quicker rest stops between dives, deeper, longer dives, etc. Anyway, knowing the weight of a full canister, fill with butane to an amount 20% of the full weight, and then fill with propane the rest of the way. Why? Because it has to be cheaper then buying a bunch of IsoButane canisters when you could refuel a dozen or so from a 20lb LPG bottle and some butane. The questions are: Where can I get Butane in bulk? I would only need 4lbs of butane to a 20lb LPG tank. Where can I get adapters that would fit on the canister? I looked into getting a remote stove stand from Brunton that has a female end for the IsoButane canister, and take it apart at the other end and adapt it to fit a 20lb LPG tank. The next problem is, how can I get Butane? Is it sold in bulk? What type of an adaptor do I need to make to make the whole thing work?