I just got rid of my 6.7. I loved the truck but the fuel mileage sucked. It really sucked towing. 11MPG It was bone stock. I had the 5,9 before and it was awesome on fuel. Cummins are awesome. I dont think its a 5.9 versus a 6.7 thing. I think it is the newer 6.7 has all that pollution crap on it. Finding a low mileage 5.9 may be tough.
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