Zero Turn Mower. I'm stumped.

Lucas Ethanol Treatment works wonders, never tried the ol' Sta-Bil because this stuff does what it advertises and is specifically intended for ethanol-gasoline blend fuels including E-85. I had a container of regular-grade E-10 that had to be at least 1.5 years old I gave to a friend with a push mower I sold him in February, still smelled fresh and worked fine the few times I had to run my snowblower this past winter and when I had filled it I put in 1-2 ounces of Lucas. Like the Frank's Red Hot commercial, "I put that sh** in everything" lol. My old D200 truck, the Duster, my new-to-me John Deere E130 riding mower, my 2-stroke weed trimmer (when I don't use the overpriced pre-mixed stuff in a can). Only engine that doesn't get it is the 3800 in my Buick as it's my daily driver and it needs premium due to the supercharger.