MarkB_MI, I just went to 89 octane as precaution to prevent the possibility of pre-ignition, detionation.
So what if I got the actual octaning rating wrong? I read someplace that adding 5% ethanol boosts the octane 1 point. So again, I think octane rating is irrelevant, I have 89 + octane instead of 90+.
My goal is to lean out engine, not make carbon, and it appears to be working because I'm seeing less carbon on piston and plug.
Snake oils in fuel have never worked. As for top tier fuels, I use marathon, King Richard claims there is something in marathon gas.
So who sells top tier fuel? Most of the fuel in my town comes from the Marathon refinery. george
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