I was re-reading my 2003 owner's manual last week and noticed that the compression is lowest on the 2.7T, rising as you go to the 3.0 and 4.2 engines. So I may be able to just get away with midrange in my 2.7T that would cause knocking in the other two cars.

the techs at sewickley audi in pittsburgh,pa say that 89 octane is perfect for these cars. puttin 93 premium in it is just costing you more money. deffenitly stay away from the 83 becuase it will actually give you worse gas economy and it will mess **** up.

lower grade gas will **** up your engine.
I have a 300zx and if u put anything besides at least 91, say bye.

I dont know about that dude. the compression is lower. Because of the turbos.
i really dont get it.. just spend the extra $200 a year..
I have a 2.7 .. It was running GREAT. I stopped for gas in Jersey and they pump it for you. I said 91.. I thought the price was a ltitle lower for a full tank but didnt look. I have pinging now.. Serious pinging if I really get on it. And im betting that jerk put in 87. Im going to fill up with 93 today and see if it goes away. And I am NEVER goign to let anyoen put anythign but 93 in my baby again. Would you feed your kid infant Mickey dees and soda or baby food and milk?