I was wandering about running high octane in my 225 EfI Merc? I heard somewhere that it wasnt good to run high octane in a outboard, but i found some high octane without ethenal.
Just about all I run in my injected 2.5L Mariner 225 is the 91 octane thats 100% pure from Harrison Bay State Park!!! They have it now on the dock for just 3.87 a gallon.. Not bad for on the water pumps