I used my CC for the first field trip, last August. I tried it at home first, elevation around 3800'. Boil time for 1.5 cups of water were the same at 9,000'+, I believe a little over 7 minutes for me, using 5/8-3/4 oz alky, .9 REI ti pot. I'll be out for a week starting Friday AM in the Mammoth Lakes area. I always recovered un-used fuel.