Just out of sheer curiosity I boiled the same amount on my new Optimus Crux just now. The same amount of water (inside on the stove top) boiled in 2 minutes and 20 seconds...and I mean BOILED. It was ready to jump out of the cup it was boiling so hard.

Let all of it, stove and fuel, sit outside for a couple hours to get to the outdoor temp. You'll get even worse performance.

I did (for the Triad).

I'm going to keep doing it as it gets colder until the stove won't light so I know at what point I shouldn't bother even busting it out.

I just ran the identical test...everything the same except the temperature (it's -20 C tonight) and something unexpected happened.

The water boiled in about the same time but this time the stove ran for a mind boggling 31 minutes! 10 full minutes longer than what it's rated to do. I wouldn't have believed it if I had not have been sitting out in the cold with a digital probe thermometer freezing my buns off watching it go.