I found Rand's email to me on esbit for the JMT. Take a look, lots of great info.
"As to 10 days with 2 cup boils each day. If you are truly counting
grams, I suggest you go with our esbit solution...the Gram
Cracker...over alcohol. It is more efficient (BTU/gram of weight)
than alcohol, the "stove" is much lighter, will never leak in your
pack, and is relatively insensitive to altitude differences. Esbit typically beats alcohol
every time in the cone.
Each esbit tablet is something like 14gm/.5oz and the GramCracker
stove is 7 grams. As to fuel usage with esbit, you can EASILY get a
cup boil on one tablet.....and....depending on water temp and
altitude.....I have often been able to blow out the tablet after 2
cups of water boiled and still have enough to do another 2 cup boil!
For safety sake, I would still probably count on one esbit tablet a
Now....the philosophy.....what I think happens in "normal" cooking
situations is that windscreens are loose, air flow dodgy, and heat
transfer inefficient. So, if you have an esbit solution with a
windscreen/pot setup, the flame is very lazy and gets knocked around
alot. That is the reason I think most people go with the
"jetted"/pressure alcohol stoves....to direct and force the heat in
the direction they want. Now, with the Caldera Cone in place, the
"lazyness" of the esbit flame isn't an issue.....all the heat is
captured inside the cone environment and blankets the pot. So, with
the advent of the cone, the inherently higher heat content in the
esbit tips the scale back in favor of it for efficiency."