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I have read that the BMW recommended premium unleaded (octane 91-92 USA) will give you the best MPG. You can run lower octane like regular (octane 89 USA) in the engine; because of the anti-knock sensors that retards ignition. But I would not! Lower octane will equate to lower MPG and possible problems over time.
I assume everyone is quoting MPG using Premium Unleaded (in the USA)..
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