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      11-20-2012, 07:19 AM   #18
cstavaru
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Quote:
Originally Posted by SF Space Grey View Post
whether 100 octane gas yields additional power from the N54 without an aftermarket tune?
No. You have the same boost, same timing, same air-fuel ratio and same fuel energy. Of course you will not gain anything.

Higher octane means higher resistance to knock which means you can increase the timing advance. Without this, you will not gain anything.