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Old 04-09-2012, 08:47 AM   #51
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Join Date: Feb 2012
Location: chicago
Posts: 35
My Ride: 2002 330cic
101 is different in Germany than it would be in the USA.
Europe uses ROM only for octane rating, while USA uses ROM + MOT (R+M/2) to get the AKI octane rating seen at the pump.
What that means is that a fuel with a 101 ROM rating only might end up being 93 after the MOT (motor octane) rating gets figured in.
The MOT rating tends to be much lower.
There is no direct translation or comparison available to easily compare the ratings.
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