I use 87 or 89 octane. I experimented with all grades in 4 smokers. (87 to 93) and found it made less difference then the weather if it made any at all.
I have not been able to find ethanol free gas here in CT. This discussion got me thinking. Just filter it out. Seems like a no go. filter out ethonol - Google Search
So thought just use fuel stabilizer and a water separator. Overton'sŪ > Fuel Filter/Water Separator - Boating & Marine > Fuel Systems > Fuel Filters : Marine Fuel Tanks, Gas Tanks, Parts, Boat Fuel Accessories, Fuel Supplies
Then I thought, forget this. snicker