I am new to posting, but have been learning a lot on this site since purchasing my Jeep. That being said if I am posting this incorrectly, please let me know! I remember reading a post about fuel economy and some users stating they average 25-25 mpg without issues and others saying they are lucky to get 18-19. Well I have had my Cherokee for nearly about 3 weeks now and think I may have discovered something they may help some others. I drive a decent amount of miles so I am already nearing 1000 miles, and for the first 500ish everything was great and I too was getting the 24-25 mpg. Then suddenly two tanks of gas ago it dropped a decent amount without explanation to the 18-19 mpg. I have not done any mods to my Jeep yet... I also noticed it suddenly felt as though the vehicle had some drag when I let off the accelerator which I had not felt before. I was worried I may have some transmission issues, but I haven't read anything yet about the 21 year having much issue. I have tried to learn everything I could about the ADII but it seems info is lacking... Now to my solution that seems to fix the issue. The ADII does not have a 2 wheel drive lock mode, only the Auto mode as I'm sure everyone knows. That got me thinking about my issue. I started wondering if the front differential was unnecessarily engaging, and I think it was... I came to a complete stop, put the Jeep in Sport mode and drove that way for about 5 miles. I then came to another complete stop and returned the dial to Auto mode. Since doing that the feeling of drag is gone and my fuel economy has returned to the 24-25 mpg. I am wondering if maybe the system just needs to be used from time to time instead of leaving it in Auto all the time. Don't know if this will help anyone else, but it seems to have fixed my problem so I thought I would share in the off chance it could help someone else. Thanks again to everyone here for all the information and experiences you have posted!