2 years ago we had to start using ethanol, nothing but problems that year.
Last year we switched to rec gas--90 octane, ethanol free--and had one runnability issue in August due to gas.
This year, we've replaced 2 carbs on mowers (1 was bad at the end of last year already) and 4 trimmer\edger carbs. Pretty sure this was due to the ethanol prior to last year.
Ethanol is crap. Bad for engines, bad for the economy but good for the farmers. Stupid gov't.
"Science is the belief in the ignorance of the experts" – Richard Feynman