I have the Caldera Cone System with the Esbit gram cracker stove. I plan to place 2 esbits in the stove one on top of the other. I am going with a friend and I was wondering if it is more fuel efficient to boil the Foster's can filled close to the top, or to fill the Foster can up to the top of the cone twice, letting the esbit continue to burn as I pour water out and cold water back in for a second time. I was hoping someone knows this answer so I don't have to waste fuel testing it out myself.
