Winter and Butane

I've been doing alot of online research and trying to find ways to optimize the working range of my Cartridge style stove. I've already sourced out fuel that is a Isobutane/Propane mix. (Iso has a boiling point around 11F and Pro around -31F) I have an upcoming white mountains trip this month and although a campfire will be the primary heat and cooking source I like the challenge of making the cartridge stove work.

So far I've source out a fuel, bought a stand to allow me to run a proper windscreen without overheating the cartridge. I'm thinking of making a sac with foam bottom (to insulate from the ground) and space to toss a handwarmer or two in with the cartridge.

What do you all think?

Any comments or Ideas are welcome I'll get some pics this week.

I used my isobutane fired MSR Pocket Rocket in 4 and 5 degree mornings, here in CA last fall. I should have just heated some water then added more after I dipped the cansiter in the heated water to vaporize the fuel, which made a very noticeable increase in the flame/noise. However, if you can heat up your fuel before hand, do that. If melting snow, use white gas powered stoves.