1994 Johnson/Evinrude "ER" 2 thru 8 outboards Service Manual, Page 61Get this manual
Fuel Requirements
Minimum Octane Models Recommendation (R+M)2 "AKI" "RON"
See fuel classifications below
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 alcohol by volume:
10 ETHANOL or METHANOL with cosolvents