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I noticed the same thing I only have 2600 miles on mine but I am getting a soot buildup on my tail pipe. I am also only getting 16.5 mpg average with my max tow. I was thinking it is part due to the large mirrors and 3.73 axles. Have been thinking maybe the computer runs the engine rich at first.
__________________ 2011 F150 Xlt Crew Cab 4x4, Sterling Gray, 3.5L EcoBoost, Max Tow, Back up camera and tailgate steps
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