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Old 12-24-2013, 03:17 PM   #22
SamE30e
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Join Date: Jul 2007
Location: Milton
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Fuel is a major contributor. Whatever is advertised, could be on a better fuel in lower ambient temps on a less humid day. Even the ethanol content or water content in the tank is huge.

The difference between 91 octane and 94 octane is pretty big. My car made 15% more HP of 94 than when I tuned it on 91.
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