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Message: [QUOTE="wetnsloppy4x, post: 290566, member: 395"] Agreed. You need to go through the runnability with a fine toothed comb before anything else IMO. If you don't have one already, an AE will be a huge help diagnosing anything thats going wrong. There could be a number of components on the verge of going bad that aren't throwing a CEL, but keeping your truck from running optimally. Once you have it running 100%, absolutley do this. The newer flashes kill mileage. Doing this will help a little too. Another thing to consider is that in Oregon, you are likely getting winter blend diesel right now. You'll pick up a mpg or two when the switch to summer blend happens. [/QUOTE]

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