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I just started putting premium gas (91 AON) back into my 9-3SS. Honestly, I can't really tell the difference, between mid-grade 89 AON and 91 AON gas, in regards to performance. But at this particular chain of gas station, I am getting the premium gas for the same price as the mid-grade gas. It's not chevron, but I will see how it runs over time. Currently, the car is running quite the same as when it was on the 89 AON gas.
 

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I noticed the same....which is why I stuck with 89

In the event I could get 91 for the same price..why not? But I dont think there really is anything more or less to gain by going 91 (unless you have PPC?)
 

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Do you guys have the 2.0t or 2.0T?
 
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