Speaking as someone with the B&S Master Service Tech paperwork, working on all sorts of engines over the years, for my small engines i use the synthetic TruFuel for anything where cost won't make much difference, like my blower, but for any other engines i just run them dry whenever I expect to leave them over a month. At the end of the season, I use the synthetic only for the last use, not necessarily a fill, and sometimes run that dry, but I doubt I have to. It's not a good idea to run 2-strokes dry because dry = no lubrication.
The problem isn't ethanol, the problem is ethanol + moisture causing a phase change in the ethanol. It's gross. Sometimes even an ultrasonic cleaner won't clear the goo out of the smaller passages.
https://www.briggsandstratton.com/na/en_us/support/faqs/browse/fuel-recommendations.html
Contrary to what that article says, I think Sta-Bil elixer is useless based on the state of people's carbs after swearing on a stack of bibles that they used it religiously. Perhaps it's the way it's being used. I'd rather spend the money, time and effort on judicious use of some TruFuel to avoid the issue entirely.
I get so tired of people arguing that they never used Sta-Bil or anything in their grandfathers xyz machine and never had a problem using that anecdote to cure anyone's ills after essentially dissing other's experiences. I also get tired of people saying Sta-Bil solves everything.
Another gripe is people saying premium, is non-ethanol, but only at certain stations. If you want to make yourself some work buy one of these:
https://www.amazon.ca/Boost-Monkey-...ZBX/ref=sr_1_7?keywords=ethanol+tester&sr=8-7 The Echo regional rep gave these away during annual tech updates. All the effort doing testing however, can just be avoided by what I have suggested earlier.
I don't mind earning money on other people's refusal to manage moisture/ethanol, but i really dislike working on my own equipment when some simple work-arounds eliminate the problems of moisture/ethanol.