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Old 03-17-2017, 02:33 PM   #190
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Drives: 2013 Golf GTI
Join Date: Feb 2017
Location: SoCal
Posts: 94
Originally Posted by brobst View Post
They have tunes for specific octanes. 93 tune will make more power than 91 tune
^This. But this is the case because assuming 93 octane fuel allows for more aggressive tune settings.

Running 93 oct on a 91 oct tune should not yield tangible more power, i.e. it is all about minimum rating: once met, the engine is happy. Go over it, it doesn't go much happier...but go under it...
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