07-07-2013, 11:13 AM
I've been using 91 from the git-go. The bike runs awesomely on it so I am loathe to go back to 87. I wonder if it does provide more power; I know many engines these days have knock sensors and can advance the ignition automagically to take advantage of the higher octane. My FJ Cruiser had this but no way would I pay a fortune for fuel in that thing. 17 mpg average. They said you got about 15 more horse with 91, though. Matter of fact I will try it in the FZ8 next couple tanks.
