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Can anyone tell me if they use the 91 tune running 89 octane? We only seem to have 87, 89, and 93 octane available around here. (Completely stock SE.)
 

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Discussion Starter #3
Your only saving $2 or so a tank by useing 89 over 93.

Very true. I guess I'll fill up with 93 next time and try the 93 tune.
 

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I use the 91 tune with 93 octane gas. Was using the 93 tune but it tripped the knock sensor a couple of times so I installed the 91 tune. I think it may actually run better on the 91 tune.
 

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Any dyno numbers on what these 89, 91, and 93 tunes will do compared to a stock '10 3.5? I'd really like to find out.
 
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