Quote:
Originally Posted by serialk11r
The owner's manual says fill with 93, 91 is okay if that's all you have, but you may hear slight knocking. If the manual admits that you may get some knocking with 91, then I think it's safe to say there should be a small difference, easily perceptible or not.
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Again, only if you actually knock and the ECU detects and retards timing. There's a whole lot of factors involved.