From the owners manual:
Use either leaded or unleaded gasoline with a minimum pump octane number of 87 = (R + M/2) octane. Do not use fuel with ethanol content greater than 10 percent, such as E-85 fuel.
You don''t need 93 octane, but most high octane fuels contain less ethanol than the lower grades. Just try to get non-ethanol fuel whenever possible. I was using VP Racing SEF (94 octane) in my snow blower, generators, but we got a new Casey's General Store and they have one pump of 91 octane ethanol free fuel, so I no longer have to drive 20 miles for ethanol free pump gas or use SEF. Look around - you might have a station near you with alcohol free gas.
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