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 - Persistence Pays Off - by Sam Grice. About a year ago I was driving down Hwy 36 south of Houston and I saw an old John Deere H sitting in a field with the planters and cultivators still on it. It appeared that it hadn't run in some time, but I stopped and went to the farm house and asked if the tractor was for sale. The lady of the house who answered the door offered no answer, but said that she would talk to her husband and have him call me. I figured he was away at the time. Well I heard from him the next day, and he procee
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