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I agree the fuel mileage is down, however our pull with the 2008 Chevy DRW, I got 10.5 running thru the country 130 miles total and 60 miles of that was interstate. I run at 68 mph but I am looking for the sweet spot, you have to run at different speeds to see were you Truck does the best. I got 18.4 one time while not towing, my Truck just turned 5,000 miles this was hand calculated. Our weight is 22,180 loaded for movement. I read a lot of forums and the Super Duties F-450 are getting 6 to 9 towing and just under 13 on the highway. Ford has stopped letting you order the 4.88 rear gear on the 450's, but you can get the 4.30 and tow the same weight? The Cummins seem to do a little better than GM and for sure better than the Fords F-450. On job 3 Ford Trucks you get a bigger air dam for the front. Some say the mileage increased 1 mpg. The EPA has wacked again. I doubt if any of the so smart people at EPA has ever ever driven a Diesel. If I can get 10 towing and 14 to 16 just running around. I will be still keep a Diesel. Good Luck... GBY...
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