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Is there any data on 91 vs. 93 performance with any of the 2-series engines?
It is well known that there is no value in overdoing octane. A car designed for 87 will not perform any better with a higher-octane fuel.
My recollection is that BMW recommends 91 (USA), but says that you can use 89 in a pinch. Nothing about 91 vs. 93.
I am referring to engines with standard tunes only, not tuned engines, which are an entirely different story.
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