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Honda recommends 87 octane for the F4i.
Higher octane gas does not "burn more efficiently" or "run better." Higher octane prevents knock (detonation, preignition); unless you have higher compression or are tuning the bike yourself, you probably aren't going to need higher octane. A stock F4i on 87 octane shouldn't be knocking (I don't think Honda's engineering is that bad).
Basically, using higher octane is just a waste of money and can actually reduce power since it burns slower (in order to prevent knock).
Higher octane gas does not "burn more efficiently" or "run better." Higher octane prevents knock (detonation, preignition); unless you have higher compression or are tuning the bike yourself, you probably aren't going to need higher octane. A stock F4i on 87 octane shouldn't be knocking (I don't think Honda's engineering is that bad).
Basically, using higher octane is just a waste of money and can actually reduce power since it burns slower (in order to prevent knock).
