First off... Running more octane than the engine needs is a waste of money.
I tend to run only enough octane to keep it out of detonation with a crisp tune up.
Second, when I raced motorcycles there were all sorts of guys in spec classes that would run sunoco 110, etc in the bikes. Got their rears kicked by a bike running 91-93 from the local cheap circle K pump! The bikes didn't need the octane. I schooled bunches of them on long straights where 2-3hp was a BIG deal.
I'd test it with pump gas and see how it reacts.