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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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#26
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Jack's got a good point. But I have also noticed that my truck runs different when they make the switch. I also remember Bill recommending to someone who was having trouble to run 91 tune even though there was 87 in the tank. Maybe they mix the winter stuff to resemble the higher grade fuels.
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