How long can GASOLINE be stored......???

[Sourdough]

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[Rick]

From the American Petroleum Institute:

How long can gasoline be safely stored? If the container or gas tank will not be used right away, will be exposed to direct sunlight, or will be stored at temperatures above 80° F much of the time, add a fuel stabilizer/additive to the gasoline when you first buy it, prior to storage. Fuel stabilizers contain antioxidants, which prevent gum and other compounds from forming on gasoline; biocides, which prevent microbial growth; and corrosion inhibitors, which prevent the formation of rust and corrosion. Fuel stabilizers/additives are available at auto parts stores.

Many manufacturers of engines put restrictions on the amount of time gasoline should be stored before use in engines. Always refer to the manufacturer's recommendations. Freshness is improved if the container or gas tank is stored in a cool place and is kept almost 95 percent full. However, leave some headroom for gasoline to expand if it warms up in storage. Without an airspace, expansion will force liquid gasoline out of the container or distort the container.

From Vinefuels.com:

How long does gasoline keep before it starts to break down?
Because of the tendency for gasoline to start evaporating its lighter components, loss of quality starts right away, but the process takes place so slowly, it takes over a year for it to become noticeable. Gasoline that has been stored for 3 years or more should not be used unless mixed with fresh fuel. Gasoline stored for longer terms can cause problems with a vehicles’s fuel system by depositing a varnish that will coat the system, making expensive repairs/cleaning necessary before the engine will run again. Dispel fuel, because it is more stable than gasoline in storage, can be stored much longer than gas before deterioration occurs.

That's about the best I can do.