Ok so the trip is done and I am so glad I bought the chip. I got as high as 22 mpg on a nebraka expey doing about 45-50. The freeway varied between 18-21 depending on grade altitude and speed. The chip is one of the best investments I made for the truck. 
Joe
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 2003 4x4 F350 Super Duty Crew Cab Short Bed
4" Down pipe and exhaust, Wicked Wheel, Modified Exhaust Turbo Housing, Big Head Waste Gate Actuator, PML Transmission Pan, Factory Tech Valve Body, Autometer Gage Pod, PHP FU2 Chip
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