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      09-16-2012, 07:41 PM   #23
heffs550
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Drives: 550i M-Sport
Join Date: Jul 2012
Location: United States

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Maybe this is a silly question, but are all of you guys using premium (93 octane)? I notice a dramatic difference in throttle response if I fill up with mid-grade 89. With premium there's much less delay.
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