I know a little about ethanol my dad worked at a ethanol plant for 10 yrs and we messed around with in some race motors
The onlytime i we ever needed to put a top cyl lube is when we ran e85 witch is 85% ethanol
It has no real lube value but jegs summit and most local parts store can get ya top cyl lube and you can get it in differnt scents blue berry was my fav
If your motor is stock or close to it 87 or 91 is fine you wont hurt anything
Stay away from e85 unless your carb and fuel lines are set up for it
And e85 has been know to decrease your millage up to 20%