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      02-04-2012, 11:14 AM   #7
Tom K.
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Drives: '07 328iT, '13 Boxster
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Location: Maryland

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While BMW has tuned the 328i for 91 octane, it will run satisfactorily on 87 (see the owner's manual) with possibly some performance/economy degradation under certain circumstances.

My experience has been that 89 is not cost effective - either opt for 91/93 or go with 87. Another possibility is to alternate tanks of regular and premium.