I will give you guy an idea how corrosive the ethanol is.
We have site glasses where we can see the fuel going in and out of the tank when we load or unload the tanker. With-in two weeks of starting to add ethanol to the fuel we had to replace all the site glass and gasgets. The gasgets got ate up and the site glass which was made of plexie type glass all craked and were braking apart. Now we use real glass and metal gasgets instead of the paper gasgets we had usd for years. The metal gasgets even needs replaced every six months or so now. So the ethanol is some bad stuff. The Sta-Bil will definetly help, my buddy runs a yard were folks store their motor homes and they all use that Sta-Bil and they don't have any problems.
Unfortunatly for my Vette carb I found out about Sta-Bil to late, it's all ate up inside.
Oh and I hate to say it but not all of the tanker drives get their blends right so you could also get what we call a hot load with more ethanol then it was supposed to have.
I know this because thats what I did for years when I was not training other drivers. I would go around trying to fix other drivers mistakes or pumping tanks out that could not be fixed.
Kurt