"I figure the faster the boil time the less fuel used.."
Ben's right in saying that this is not true.....but did I want to kinda explain it a little differently. If you pump heat out of the stove really really fast, the pot won't absorb the heat as fast as you are pumping it out. Quite a bit of that heat is lost to the atmosphere. The experiment you can perform to test this is to hold your hands near the top of the pot/windscreen. If you feel heat coming off, that is heat that is not going into boiling your water....and consequently fuel that is used to create the heat that isn't being put into your water/food. So, while it seems counter-intuitive, the faster the boil time, the MORE fuel is used.....because you are using a good bit of that to heat the campsite too.
Since he brought up the Caldera Cone, that is an example of a system that holds the hot stove exhaust next to the pot for longer, so when the system exhaust comes out the upper vents, it is not much hotter than the water in the pot. Pretty efficient.
...but I'm just a cottage guy....so clearly no innovation here....