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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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