Coleman Fuel Storage & Use
An un-opened container of Coleman Fuel stored in a dry area with no rapid extreme changes in temperature will remain viable for five to seven years. An opened container stored in the same area will remain viable for up to two years though will be at its best if used within a year.
Do not attempt to use Coleman Fuel in an internal combustion engine. Coleman Fuel is very low octane with none of the additives needed for engine use. It burns very hot and will burn the valves out of an engine.
Cans should be dated upon purchase and older stock is used first. Your stoves lanterns etc that burn the fuel should be used on a regular basis. This will insure that the equipment is in good working order and that the fuel is used and rotated.
Have a plan to make breakfast one Saturday a month on your Coleman stove and use your lanterns instead of a flashlight. When I was a kid we would use the Coleman lanterns for evening chores, they were brighter and more useful then a flash light. Use them on your deck in the evening to when you are setting out having coffee to allwo them to runn for an hour or so.