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RON = research octane rating
MON = Motor Octane rating
Europe uses RON and the US uses an average of the two to tell what kind of gas you are getting. I am trying to look for a reference to explain it in depth, but I can't find a good one right now.
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Collin
1995 L AWD
Locker
1987 Porsche 944 turbo
80k miles. MBC + Chips. Relatively Stock  
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