Hello all...got a little confusion regarding how fuels are rated...gasoline vs diesel and octane vs cetane. I was under the assumption that octane ratings...say 87 octane was a ratio of 87% Octane to 13% ?? I thought that octane was C8H18...and was the main constituant of gasoline. Am I wrong, if not what is the other 13% and does this formula relate to Cetane...is there C8H18 in Cetane? I believe that Methane is CH4, Propane is like C2H8, I guess I only know enough of chemistry to be dangerous to myself...anyone out there with a PhD in Chemistry???

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1983 300SD... 269,000 miles, nearly 2,500 on my B-100, Faded Grey, Ugly in an elegant sort of way...Duh-Benz


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