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I had a 2008 King Ranch Ford F350 dually. I thought I had bought a 4:10. But found later that it was a 4:33. Lots of power and torque, but it was a diesel sucking combo. Even not pulling on a good day I would get 14-15 mpg. Towing my Big Sky the best was about 9 going down hill with a tail wind (some exaggeration here). I traded for a 2011 King Ranch F350 6.7 SWD with a 3:55. There was no downside in power and towing, but huge difference in mileage.
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