Zero Turn Mower. I'm stumped.

Rusty several QT stations around me in Atlanta have started selling no ethanol 87 octane. I have been using ethanol free gas in all my small equipment for years and have had very few problems as a result.
Yup. We have a local station in Gray that sells 90 non ethanol. I've actually read where even the "supposed" non ethanol now has a small amount. Who knows?