Fuel for my brand new Kawasaki Vulcan 900 Custom Cruiser?

A couple of weeks I had posted a question regarding advise for a 2007 Honda Shadow Spirit 750 c2 or a 2007 Kawasaki Vulcan 900 Custom. As you see I got the 900 Custom and I think I made the best choice so far. THANK YOU for your advise.

My new question is:
What type of fuel would I need on this new 900 Custom??? On the manual its kind of confusing but I believe it says 90 or higher. This question is not about the money but for the best performance. In my experience the higher octane sometimes made a difference with my vehicles but since this is my first motorcycle then I need your advise again. The last thing I want on my new bike is knocking or some sort of problem. So if 92 or 93 really makes a difference for better then please let me know. Thanks in advance for your advise!

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