You need to do some more research. As has been stated, a number of factors come into play. You are off base with your setup, but a windscreen to direct heat around your pot would have helped the most I think, I've only been doing the Caldera Cone setup on a couple week long bp vacations. Two cups of water should boil a whole lot faster and use a small fraction of the fuel. Less fuel = less packed weight. For the amount of fuel you used, I used that much fixing dinner for 6 nights and one hot breakfast last Summer on my vacation, that is how efficient the Caldera Cone setup is. Distance from flame to pot is very critical. I've only experimented with a potted meat/cat food can a few times and my penny stove a few times with my Fosters pot and hardware cloth pot stand. The Fosters pot ran circles around your setup and I only had a quickly rigged windscreen, testing at home on my work bench. Something for you to test with the cold and short days.
Duane