David I do not recommend tuners on the more modern diesel trucks. What I have been doing and seems to work well on the 6.4 engines is to remove the entire factory exhaust and then I have a local fellow flash the ECM with a program that deletes the EGR and regeneration requirements. He leaves the fuel setting at the factory specs. So just a little more HP from a less restricted exhaust and seems to made the MPG go up 2-3. I think the engines will run longer without the EGR gases getting burned. Plus the motor not running HOT during the Particulate filter burn out.
I know your 6.7 is a totally different animal but the same thing can be done to it. Local livestock hauler has his done. He keeps all the factory exhaust an just reinstalls it and has the ECM flashed back to factory when he trades.
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