Which Octane Do You Use?

31814 Views 47 Replies 20 Participants Last post by E_Net_Rider, Dec 27, 2009

Duckybill

Discussion Starter · Nov 29, 2009

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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Yefeng

· #2 · Nov 29, 2009

I'd say the best to use is 91 octane. As the 4cyl is not a high performance vehicle 91 is sufficent. whatever u do though, never run on 87 octane or lower as that will cause problems for your fuel filter and it will misfire, and drive like crap. Thats from my experience

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