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My wife has the same vehicle. Although she puts 91 in it all the time now, for a while she was putting 87. As most have said, the ecu will adjust but you definitely don't get the most out of that engine (supercharged V6). It was a noticeable difference which is what lead me to asking her what she had been putting in.
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Current: 2024 BMW M3 Competition xDrive | 2022 Audi Q7
Gone: 2022 Audi RS5 | 2020 BMW M340i | 2019 Audi RS5
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