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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Best gas

Old 08-19-2009, 12:19 PM
  #1  
stang23456
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Default Best gas

Better to run 87 or 89 octane in my 04 GT ? I have full exhaust and CAI.
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Old 08-19-2009, 12:24 PM
  #2  
DreamerGT
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87 octane
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Old 08-19-2009, 12:25 PM
  #3  
teej281
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87, you get no benefit outta 89. Your stock tune is for 87 gas...so dont bother using anything more than that.
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Old 08-19-2009, 12:47 PM
  #4  
IRSmart
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Default

87

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