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Old 03-23-2007, 04:24 PM   #15
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Join Date: Jan 2001
Location: Columbia,SC, 29223 USA
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My 2000 Dodge with a cummins diesel and 4:10 rear end gets, when towing a 10.4K 5er, reliably over 10 to 11 mpg on fairly level ground. In the mountains it will drop to 9.5 and on flat land I have seen up to 13 mpg with a tail wind.

Retired Navy. 2001 Quad Cab 2500 Auto w/4:10 rear end. PRXB Pac Brake. Miller Manufacturing Truck Bed Cover and Rigged to tow a 1995 29' Automate 5th wheel with 1 slide out
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Old 03-23-2007, 08:39 PM   #16
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Join Date: Oct 2006
Location: Hillsboro, Oregon
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I'm "shiftless" so I like an auto. And the GM DuraMax/Allison combo is a dream!

2006 Chevrolet Silverado 3500

Crew Cab, Banks Power
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Old 03-26-2007, 01:04 PM   #17
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Well, I know the 6.0 Ford has a deserved bad rap, but I think Ford got most of the kinks out. I looked at all the TSBs before I bought mine, and after 05, most of the drivetrain TSBs went away. That's what made me feel better about buying a Ford. I only have 2800 miles on mine, but I've been towing some pretty good grades in that time and haven't had a problem. I get 7 mpg towing lots of grades in a headwind, and 9.5 - 10 mpg on flats. That's with a 17k 5er and 4.30 gears going 65-70 mph. Also, I went with an auto. I would have purchased a Duramax/Allison, but you can only get 3.73s in the dually. I don't know why chevy did that, but that's really what it came down to. Good look on whatever you purchase.

2007 Jayco ReconZX
2008 Ford F350 CC DRW 6.4 5sp TorqueShift Tow Boss 26k#GCWR
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