I have a quad cab short bed, hemi, 04 with the 3.55 rear and 17 in tires. My best mpg have been 16.4 highway- 12.0 city. I usually get 10 city. 14 highway.haven't had it long enough to drive it in the summer.. Pulled my boat once got 13.4 mpg.. It weighs 6,000 loaded. Has about 4,000 miles on it now. Should get better around 10,000 .miles. It also has duals and an k/n air filter.

 

CATs

 

you dont have to have the 3.92's. We have the Lone Star edition and 3.55's with the 20's. I even confirmed it through math using RPM, OD ratio, and tire size, still came to 3.55. Then again, we have the 5 speed auto 545RE.