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Propane, Butane and Isobutane all have similar heat values and work more or less the same above freezing temperatures. These fuels will not work well bellow their respective boiling points since they won't be able to build up sufficient pressure for stove operation, so the differences in fuel performance by and large relates to fuel's boiling points. The lower the boiling point, the less likely it will fail in the cold. Propane (LPG, Liquified Propane Gas) Great hot burning fuel that works at low temperatures and at high altitudes. Due to high pressures of propane (close to five times that of butane at room temperature), propane canisters are made of thick heavy steel. Pure propane is not recommended for stoves designed to run mostly butane and/or isobutane without a pressure regulator. Propane is generally used for heavy duty stoves, lanterns, heaters and torches. Boiling point: -43°F(-40°C) Fuel will not vaporizes well below its boiling point. Butane (n-butane) Works well at high altitudes but burns poorly below 40°F due to poor vaporization at low temperatures. Butane is commonly used in backpacking and portable stoves, lighters, small torches and as a propellant for aerosol cans. Boiling point: 31°F(0.5°C) Fuel will not vaporizes well below its boiling point. Isobutane Isobutane is a structural isomer of butane with a lower boiling point. Manufactures claim that isobutane provides a steady flow without tapering off as the canister empties and is added to butane to increase its performance. Because of the greater vapor pressures of isobutane compared to butane, you may experience much greater flow that may blow itself out if turned up too high or possibly even damage a stove not designed for isobutane. Boiling point: 11°F(-12°C) Fuel will not vaporizes well below its boiling point. Fuel Mixes Isobutane and/or propane are often added to butane to allow stoves and lanterns to operate at subfreezing temperatures. These fuel mixes don't affect the vaporization of butane and each fuel vaporizes separately. This is important because at temperatures below the boiling point of butane, the added fuels will vaporize and be used up first. If your canister isn't warmed by the burning of the more volatile fuels, these fuels will burn off first and leave you with just butane remaining. Isobutane/Butane Blends Basically, isobutane may allow you to operate your stove at subfreezing temperatures down to 11°F(-12°C), that is - until the isobutane runs out.. Propane mixes(20-40% Propane) (Butane/Propane, Butane/Isobutane/Propane, Isobutane/Propane, IsoPro, IsoPropane) The higher the propane content the longer it will burn at lower temperatures. You may still end up with most of the butane and/or isobutane remaining in the canister if using a stove below 31°F(0.5°C) or 11°F(-12°C) respectively. Isopropane The term isopropane suggests that this is structural isomer of propane, but since propane is a three carbon hydrocarbon, a structural isomer doesn't exist. Isopropane is instead a commercial term used to describe isobutane/propane mixes (and sometimes butane/propane mixes). Manufactures claim this combo is great for low temperature use and improves fuel performance by decreasing the tapering off affect of butane alone.