The owners manual is pretty clear, No ethanol. I am curious why. I have some general knowledge about gasoline, octane ect... But in my neck of the woods I can buy 89 octane ethanol for the same price as the 87 unleaded. If my understanding of octane is correct. It refers to the point of combustion. And that higher octane not only burns hotter but more complete. And more complete = less residual gunk. I really am ignorant about the ethanol blends and how they effect the burn or combustion.

I dont have the book in front of me now. But I believe it also states that you can use between 87 and 91 octane. In this specific motor is there a benefit to using the higher octane ?

I am also wondering if there is a difference between the ethanol produced at the time of manufacturing and now. I know there have been changes and refinements in the last 12 years.