Sorry, it was 91 octane mention on page 10 of the Banks Automind programmers manual.
I have an email into Banks but sometimes it better to get the straight info from those who are using it. If you're not getting a pinging noise then what ever you're using should be Ok. I just purchased the RV from dealer so I don't know what previous owners used. I don't even know if it has the Automind program but I do know it has the Banks Power exhaust system. I have shifting problems so I was looking into the Automind.
http://assets.bankspower.com/manuals/942/97270-AutoMind_programmer-v4_web.pdf