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      06-15-2009, 07:06 PM   #22
Slidewayz
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Drives: 2007 335i
Join Date: Jan 2009
Location: Oakland, CA

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I just tried Stage III with UT set to 79%.

No codes, and it feels better than Stage II w/ UT set to 79%.

It's not a hot day, though.

Octane is a measure of knock resistance. Especially on turbo cars, every point helps. It's also not totally linear...it's not x HP / octane point.