Meh. I mean, I get what you are saying but it's heavily misleading.
"Goes bad" is relative, as it's certainly not useless, just not 'optimal' forever. And it doesn't take much to see that - Like starting a car that hasn't run in 3 years (off of the same gas). And that's my small-town Canadian side speaking, given that most of my community could pretty much be summarized as that last sentence repeated over and over.
And I still think that point is very generous considering a quick google or two will lead you into numerous stories of old gasoline still doing it's job.
I get what you are saying, but in a survival setting it just doesn't apply. Gasoline is burnable as fuel for long enough to not be a dead-set realism issue in most games. Point is, old gas still burns as fuel. The engine will still start and run, just not as well, and not be as efficient.
Side-support to prove I actually did a quick google: http://ecomodder.com/forum/showthread.php/when-old-gas-too-old-use-19021.html
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And so on.