Originally Posted by professional
I am trading my 08 F250 tomorrow. (6.4) Last year, it averaged 8.8 mpg. It will not stop the re-gen process and the dealer is not able to pinpoint the reason. I believe it is because I do not drive it long enough distances. The other day, they were able to make it re-gen in the parking lot of the dealer and we sat there for 45 mins at 2,000 rpm to get it to complete. That was after it had been in re-gen off and on all morning while driving my route. He said sometimes it can take up to 2 hrs. to complete.
DPF Delete and tune would of fixed that problem and netted you at least another 4mpg. I would steer clear of the 6.4 diesel. Mines a disaster. Might look for a clean 7.3 Diesel though.