MPG
Here in Alabama we can get 93 Octane Pure Gas -- which I run in all my small engines and have run in my N54 with some improvement in MGP but not sure if I could really notice any performance gain.
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The ethanol does attract water and is known to harm the Piezo injector crystals in the N54. On my N55 similar to your M2 N55 variant - the Bosh injectors are used due to the crappy fuel quality we have in America.
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So, you could gain MPGs but the extra cost does not equal the MPGs gained.
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Accordingly, pure gas in a car that will be sitting for long periods of time should use pure gas as well as small engines like a leaf blower where the corrosive nature of ethanol just kills the carburetor.
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However, I am a big proponent of high tier gas with quality detergent . Shell & Chevron.
Cheers.
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