I had a 08 with the 3.8 and didn't keep it long. Rubicon, auto, 35's and it was sick, even put the stock tires back on it before I sold it and I still couldn't stand it. Might not be as bad on flat ground but where I live theres alot of hills and it couldn't keep up with the flow of traffic especially on the interstate. Then recently my wife bought a 12 sport, 3.6, auto, 35's and it was night and day difference. She sold it not long ago but I loved that thing lol I couldn't believe how much of a difference it was over the old 3.8. I guess alot of it has to do with the transmission also since they're 5 spd autos now but even with the 08 with 4.10's and whatever the 3.6 auto sports have it was a huge difference imo.