I ran across a video of a fellow filling an isopropane/propane gas canister with a butane cartridge. He claims he can save a lot of money. However I wonder about the performance in cold weather, not to mention the safety of the process (says "do not refill" on the cartridge). Has anyone done that? One of the adapters he used was the Kovea Dual Gas Adapter. I believe it is made so that you can run your canister stove on a (cheap) butane cartridge. I know it would not work as well in cold weather, but the idea is interesting. HAs anyone done that?
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Jim M