European octane ratings are the RON number. US ratings are an average of RON and MON also known as the pump octane number. 96 octane in europe will correspond to approximately 92 octane in the US. The reason for the different numbers is the different test methods used.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record