The Trangia will run wide open and boil water the fastest if the pot to burner height is ~1.75". The burner works better closer if you use the simmer-ring. I looked some test results that said they burned 2oz of fuel in the Trangia and didn't boil 1qt of water. I have no idea how they got such crappy results, but they must've been doing something really wrong. I'm a Trangia bigot and I approve this posting.