My experience isn't exactly "scientific evidence" - but . . .
When I was working in a small engine and tractor shop late 1960s - early 1970s - we had many customers' machines come in with bad gas. Real bad - turned to varnish. Most often in electric generators and/or snow blowers that hadn't been started or maintained in a few years at least. So - #1 that was years ago with leaded gas and #2 it was also in New Jersey where's it's a lot warmer than here in New York.
Now - to present - 2000 and later - I have many pieces of equipemnt that sit sometimes for a few years or more with no Stabil and the gas barely turns. Starts to darken a little and smell bad - but the tractors still start right up. I've got over a 100 gas tractors and don't drain them all - or use Stabil in any except for a few I worry more about. Every year, I pick a few to get running to take to shows - and every year I pick different ones. I usually pick tractors that have sat at least two years with untreated gas (mainly because I worry they've sat too long). All have started fine with the old gas. I have more problems with no spark since points tend to get a coating on them when a tractor has sat a long time. So - at least from what I'm seeing here in New York - with New York weather and New York formulated gasoline - I don't need Stabil unless I know something is going to sit for many years. But - gas can be different all over the country - and also by winter or summer blend - as to the ingredients used in it. I suspect some gas blends go bad faster than others.
My main point is this. I wouldn't give any credit to Stabil doing anything unless . . . you've got two gas jugs bought at the same time, and stored the same amount of time in the same place - and the Stabil treated gas is fine, and the non-treated one is bad.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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