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Which Octane Do You Use?

31808 Views 47 Replies 20 Participants Last post by  E_Net_Rider
I have a 4 cyl, A6 2010 LTZ with less than 5000 miles on it. I just pumped some Shell 89 octane in it today. Thought I'd give it a try to see if I can tell any difference in MPG or performance. What do you folks like?
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We use 87 in our 3.6 and have 21,000 miles on it and never had a ping or a problem. always runs fantastic and gets great gas milage.
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