1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 20Get this manual
Fuel Requirements Minimum Octane Models Recommendation (R+M)2 "AKI"
See fuel classifications below
Preferred FuelModels with emissions tubeUse regular unleaded or premium unleaded automotive gasoline that has not been extended with alcoholModels without emissions tubeUse regular unleaded, regular leaded, or premium unleaded automotive gasoline that has not been extended with alcoholAccept able FuelAny of the above gasolines with up to the following percentage alcohol by volume :
10 ETHANOL or METHANOL with cosolvents