High on the Mountain Top
Join Date: Jan 2007
Location: New Westminster, BC, Canada.
I believe all the "standard" tests use pretty ideal conditions, though I couldn't quickly find them online.
Probably they do it at 25C, starting with 25C water, using the windscreen, even inside, to reflect heat etc. Pressure in the fuel bottle probably matters too.
6 minutes doesn't sound so slow. They might have a better pot than you too.