2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.

Tune question

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Old Dec 7, 2007 | 06:59 PM
  #11  
Gene K's Avatar
Gene K
5th Gear Member
 
Joined: Jun 2007
Posts: 2,176
From: Decatur AL USA
Default RE: Tune question

Assuming you get 19 miles per gallon and so put in 14.7 gal.
92.5 Octane. Close enough in my opinion as long as you dont have a
custom tune with deactivated knock sensors.

Just a heads up for next time. Run it down to 20 mi and put in 3 gal.
Run it back down to 20 mi and fillup. That will put you at 92.9 Oct.
Old Dec 7, 2007 | 07:04 PM
  #12  
Gene K's Avatar
Gene K
5th Gear Member
 
Joined: Jun 2007
Posts: 2,176
From: Decatur AL USA
Default RE: Tune question

ORIGINAL: ShadyNinja

on a side note
I too went to my 87 tune for winter, but the mileage was worse than my 93....
so I put some 93 in , preparing to switch back, but my 87 tune gets great mileage on 93 weird!
Different octane gasolines have a differing amount of oxygenates and need to be tuned for different AFR.
The93 octanebasically leans ther car out a little.
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