The
Scary part of this whole Ethonal debate and storeage is...And I firmly believe this.....NOBODY KNOWS. I've read a LOT of articles by the
"Experts" and the impression I get is they are all
Winging It.
Last few years I've used Sta-Bil with Fays (previously) Non Ethonal gas and never had a problem.
Now I'm using Startron with the ethonal gas. Like the guy said..next spring will tell.
Results May Vary. The good news is that your local technicion will be kept gainfully employed, replacing everything in your engine one part at a time, short of the crankshaft, until the problem goes away.

NB
PS:
Mechanics used to fix things..now Technicians replace things.