If it's rated for 87 Octane, you won't gain anything but a lighter wallet by running higher octane. Higher octane fuel burns slower however, so that may raise the temps on the exhaust valves which is not a good thing, since that's the weak link on most 4-stroke motors anyway!
The only scenario I can envision where higher octane might help is IF the engine has a knock sensor, and IF you're over-propped or one day happen to get lucky and load up with 1000 lbs of fish so you're really overloaded! A knock sensor will retard ignition timing if it hears detonation or pre-ignition, which is less likely to happen with better fuel, or if it does, the ECM won't have to retard the timing as much to stop it, so you get slightly more power.
The non-ethanol fuel we can buy here (Rec 90) is at least 90 octane and much more expensive than even 92-93 octane E-10 gas, but I think the benefits of it are worth the extra expense. Don't really need the higher octane, but avoiding the corrosion problems you can get with phase-separated E-10 gas, which can easily wipe out any cost savings from the cheaper gas is the best reason to run Rec 90 fuel if you can get it!
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