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The engine map is optimized for the recommended fuel. You can use higer Octane numbers with homeopathic increase in performance and decrease of consumption, not at all justifying the price premium. You can have the engine mapping changed to higher Octane numbers with more effect but also with the downside that you can damage the engine with lower Octane fuel. I also expect in the i8 the interaction of electric and ICE, etc. make this a futile exercise.
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