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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#5
Sat, April 9th, 2011, 10:27 PM
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If I were you I would change the 89 octane performance to a 91 performance...if you want two performance tunes. Because of how close together the ratings are there will not be any noticeable difference.
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