I have been using 91 octane since the day I bought my bike. Don't ask me why, but I switched to 89 octane today. 5 minutes later I noticed my bike running smoother, and faster with less throttle. Later on I took the bike out for another ride, had forgotten about the octane change and still noticed how unbelievably smooth it was running. Then I remembered the 89 octane. Am I Crazy!? or can lower octane be better for an engine like the ZR-7s? I literally feel like I have a new bike. Maybe I should try 87 octane? I have a Toyota Avalon and it runs significantly better on HIGHER octane. The bike on LOWER octane. Can anyone explain?