Octane ratings?

[Reel Insane]

Just wanted to get your take on which gasoline octane rating would be best for my boat and application. I know the owner’s manual says that 86 octane is minimum (I am not looking for a book answer). I currently run 93 in my vessel now. Due to the increased fuel costs I am forced to re-evaluate my octane rating to save some money for fishing. I run a 20 foot center console with a 150 TXR (carburetor model). I was planning on going down to 89 but wanted some ideas from you guys first. I am also not keen on running octane booster as I run enough additives in my fuel as it is i.e. marine stabil and ring free.

Thanks in advance,
Reel Insane

[boats.net]

87 octane will run great, higher octane is not needed.