1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 64Get this manual
Fuel Requirements
Minimum Octane Models Recommendation See fuel classifications below(R+M)2 "AKI"
PCE0020
Preferred Fuel: Any regular unleaded, regular leaded, or premium unleaded gasoline having the recommended octane rating, and not extended with alcoholAcceptable Fuel: Any of the above gasolines with up to the following percentage by volume: 10 ETHANOL or METHANOL with cosolvents
r::=:J The use of premium grade fuels is specifically encouraged Most national brand premium fuels
contain detergent and dispersant ingredients advertised to reduce intake valve and fuel injector depositsThese ingredients also remove and prevent carbon buildup on pistons and ringsThese ingredients can extend engine life while maintaining high level of performanceUnacceptable Fuel: Do not use any gasoline having more than 10 ETHANOL or more than METHANOL, even if it contains cosolvents or corrosion inhibitor, regardless of octane rating