1993 Johnson Evinrude "ET" 9.9 thru 30 Service Manual, P/N 508282, Page 60Get this manual
Fuel Requirements Minimum Octane Models Recommendation See fuel classifications below(R+M)2 "AKI" "RON"
PCE0020
Preferred FuelAny regular unleaded, regular leaded, or premium unleaded gasoline having the recommended octane rating, and not extended with alcoholAcceptable FuelAny of the above gasolines with up to the following percentage by volume: 10 ETHANOL or METHANOL with cosolvents