Liquid fuels are prohibited at BSA campouts (used by Boys). Propane is the least expensive and widely available, mixed fuels function a little better at colder temps than pure propane but the stoves are sometimes slightly higher priced. I use GAZ fuel (mixed propane and butane) stoves for my cold weather personal stove. The fuel canisters are fairly available and provide a high BTU per ounce of fuel ratio. I keep the canister in my sleeping bag at night during extremely cold (0 degrees and below)temps. Very reliable and compact stoves and lanterns are made for this fuel.