So brought the xd home getting about 18mpg. I have been really all over the board with mpg. I have seen 8.8. ,14.6 mpg, and currently getting 12.4 mpg? New to the diesel and set. Have seen the term regen on forum a few times? I have not been beating the truck and drive the same route. Mix of about 5 miles country and 5 miles interstate several times a day. I do let it idle a good bit of I just have a short stop (between 5 to 10 minutes) at a time. I have been actually trying to drive it gently to increase my mpg but seems to not be working? Could it be this regen I keep hearing about? New to diesel so don't have much experience with this? Any advice? I gotta be doing something wrong?