Thread: Octane question
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Old 10-11-2013, 04:52 AM   #10
Iam Broke
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Drives: 2012 TF3 Camaro 2SS/RS M6
Join Date: Jun 2012
Location: Dark of the Moon
Posts: 1,468
You could always splash in your own ethanol with E85 to raise the octane a few points.

There is a calculator online at to determine the octane/percentage blending your own.

The stock fuel system can handle a 1:1 blend (E47) but you need a tune for anything over around 30% ethanol to keep from popping a CEL for excessive positive fuel trims. The fuel trims adjust for the extra fuel needed after driving a few miles and the fueling carries over into the WOT fueling for positive fuel trims also. I ran 30% E with no issues when I was stock.

Avoid leaded race fuel as it will destroy your O2 sensors over a short time.
Another 1 of 371 '12 T3 LS3 M6's built.
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