AlmostThere wrote:I can get 5-6 days from the smaller canisters with my Snow Peak Giga with windscreen, boiling three cups at dinner and two at breakfast. If I get Optimus, the brand a local store sells, that does not happen. if I get Snow Peak or MSR, no problem. I filter my water first and don't get it all the way to a rolling boil.
You boil 5 cups of water a day for 5 1/2 days with a 100g canister.
That's the same as 5 1/2 cups for 1 day with 20g.
So your stove averages about 50% efficiency.
I wonder why the off-brand fuel doesn't work as well for you? Propane, butane, isobutane all have the same heat content. Maybe your stove struggles more in colder temperatures with the n-butane based Optimus brand canisters. If it takes longer to heat the water there will be greater heat loss to the environment.