i have an 05 as mentioned in my sig and have only had to replace the egr valve because when i went to clean it i skipped ahead and didnt read the part about covering the weep holes...whoops . fuel mileage was great right at 20mpg b4 the ulsd but i drive long trips working on the road and trips to utah and georgia and other long hauls cruising between 80-85 most of the time i still got 17-17.5mpg but no other mech problems.