I use the MSR PocketRocket 2, and I can get by on a 220gr can of fuel for ten days. I only heat water for freezer bag meals and coffee, and I eat non-cook lunches but always have to heat water for breakfast and dinner. I use the 220gr cans because that's usually all I can find close to me. I also have a transfer device so that I can take 1/2 can if I'm going out for 5 days, etc. 

My enter cookset consists of this stove, a 650ml TOAKS titanium pot and a TOAKS long titanium spoon.

I've used it down to less than 10F by warming the gas canister in my jacket before dinner and in my sleeping bag in the morning.

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