The 6.7 has fuel system issues and turbo issues. I dont care what anyone tells you, there is not a truck on the road with stock tires or big tires programmer or no programmer delete or no delete that is gonna get over 20mpg! If it does then they must have put 20k under the hood...and where is the savings in that?! the 6.7 shoud get around 17 or 18 on highway and the 5.9 will get 22 at 60 to 65 mph. go to 70 and itll get down to 20 or below.
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