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To enhance the convenience of small engines and their current range of application, we studied on the application of commercial liquefied butane fuel canisters containing sealed liquefied normal-butane (n-butane) and iso-butane (i-butane). In processes for extracting a fuel mixture of n-butane and i-butane in a vapor phase state, the discharge pressure dropped as the fuel within the canister was decreased, due to the phenomenon of prior discharge of the higher vapor pressure of i-butane. This pressure loss from gas discharge had to be restored by raising canister temperature which increased the butane vapor pressure. However, in the liquid phase process, since there is no pressure loss as a vapor, the canister holding temperature could be set lower than that of the vapor phase process. Moreover, when the ambient temperatures were the same or lower than the canister holding temperature, the liquid phase process was superior in terms of heat balance.