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Unless you have a tune, then 91 is fine. 93 would be a waste of money. As a side note, the 93 probably has the higher octane rating just because it has Ethanol in it. Ethanol has lower energy content so you might see a slight decrease in MPG on 93.
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2017 F30 340i RWD // MG Flasher // xHP // CG DS-1 // ZTR ZMP ZCW ZLP
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