1994 Johnson/Evinrude Outboards 40 thru 55 Service Repair Manual P/N 500608, Page 28Get this manual
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Fuel" Requirements Minimum Octane Models 40RS,45,55 40,48,50 Recommendations See fuel classifications below See fuel classifications below (R+M)2AI" 87 87 "RON" 69 90
2+4 fuel conditioner