Ford Focus Forum, Ford Focus ST Forum - View Single Post - How much better is 93 octane vs 91 octane
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Old 12-17-2012, 05:38 PM   #2
lddavis
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A tuner (you can guess which one :)) on another forum was kind enough to post their results from baselining the stock tune with 87 and 93 octane. It's not exactly what you asked, but you can imagine 91 splits the difference.



I don't know whether the ECU can advance the timing enough to make 100 worthwhile. It will adjust to whatever you put in the car, but it does have hard bounds.

Last edited by lddavis; 12-18-2012 at 12:19 PM.
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