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Changing the gas on motorcycles that have sat a single winter is a common fix, E10 has a shorter shelf life then 100% gasoline and the higher the grade of gas the longer the shelf life tends to be.
Two things happen over time, the volatile part of the gasoline evaporates leaving less flammable varnish and the gas tank can have water condense in it.
A sealed gas can or gas tank will keep gas much longer, so some lawn mowers will have their gas go bad much quicker then others, depending on how everything is vented.
The Chevy Volt starts it's engine for a number of reasons, including burning off gasoline that is in the fuel lines and injectors, but it also needs to keep the internals of the engine coated in oil.
The fuel system on the Volt is designed to keep the gas fresh for years.
In a "normal" gas can, it's often said that gas has a 6 month shelf life, at that point it will still burn in many engines, but that it starts to loose it's octane rating.
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