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I've had cars start and run on 10 year old gas, and failed to start a lawn mower with gas that sat over winter. The lawn mower breaths too easily and absorbs water.
I suspect that fuel with higher concentrations of ethanol will absorb water out of the atmosphere more readily and spoil the fuel. Perhaps the opposite of this is true, as the solution to water in a the fuel tank calls for using alcohol to absorb it.
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