Whilst planning a longish trip and looking at where I can reduce pack weight, I decided to put my old MSR gas stove under the microscope. After a bit of research I decided to update the whole cooking kit to a Jetboil system which weighs about the same as the combined MSR stove, a pot and mug. So conducted myself a little test tonight and was quite surprised by the results. To boil 400ml of water with both stoves on max, the Jetboil used 2gms of gas vs 6gms for the MSR. The MSR also took about 50sec longer to reach boil. I then simmered the 400ml for 10min where the Jetboil used 5gms vs 10gms of gas for the MSR. Quite extraordinary I thought, and very happy to have one less gas canister in the pack.