It depends on if you are okay with taking the dpf off or not. If you are not willing to take it off I personally don't have an answer. I used a edge on mine and it ended up clogging the dpf and I had to have it replaced at my cost. The major brand tuners will usually end up doing this from what I have heard.
As far as getting much more mpg, I went with Spartan Diesel and their dashsaq. It deletes the dpf and shuts off the regen resulting in major power increases and much better mpg. I have hand calculated 19 mpg when I drove my truck to colorado to go to elite diesel. Let me know if you have any other questions. Bryan