Thu, January 14th, 2010, 05:25 PM
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Forum Predator
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Join Date: Jul 2009
Location: DFW, TX
Posts: 2,688
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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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