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I own a 1M and I was wondering if their is a significative difference in performance and fuel economy between the 91 octane and 94?
have the same problem?
Tuesday, September 6th, 2011 AT 7:23 PM
Honestly, my opinion is that you won't notice a difference.
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Tuesday, September 6th, 2011 AT 7:37 PM
to post a reply.
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