As with any machinery, read the owner's manual. If it does not specifically indicate running 93 octane or higher, then doing so would be a waste of $$$$$.
I use mid-grade myself. Don't recall exactly what the book says, but it did not say 93 octane.
Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black
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