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Old 05-23-2011, 11:35 PM   #13
Joeywhat
Strichmädchen & Koks
 
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Join Date: Apr 2011
Fan#: 85247
Location: Brighton, MI
What I Drive: 2014 Mustang 3.7L SGM

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Quote:
Originally Posted by newmission View Post
Manual says 89 only. And I'm running a MTX.
Manual says you can run premium 'for improved performance'.
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