The fact that you're able to use eight year old gas doesn't mean the fuel stabilizer did anything. It just means you were lucky. I started my '92 Seville, which had four year old (untreated) gas in it, and it ran just fine. (It had a seized air conditioning compressor, and it sat for several years before I got around to figuring out why it wouldn't crank.) I was just lucky.
Now, if you have a SEALED container, gas will last a long time. But it has to be sealed well enough to be able to hold the vapor pressure of the fuel, which is typically several PSI. Also, fuel in certain parts of the country (such as California) is required to have a low vapor pressure, and that stuff in theory should last longer.
Stabil and other fuel stabilizers don't disclose how their products work. But it's safe to say they can't lower vapor pressure. And as long as the fuel's vapor pressure is higher than atmospheric pressure, you're going to have evaporation in any vented tank. And evaporation equals degradation.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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