Make sure when you get a programmer that it turns of the egr valve and the clean burn exhaust cycle. That is how you get your fuel mileage. I also knocked all the guts out of my catalytic converter and I am now getting 3 -4 mpg better than before. The reason I did this to my cummins was that at 220000 miles a warning came on the overhead that said catalyst full. By that time the exhaust system had malfunctioned taking my turbo out and carboning up the engine. All of the diesels on the market today have problems with their clean burn exhaust system and all cost major money when they break to repair. Also this is todays trucks don't get the fuel mileage that the older models got.
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