I was wonder what i can expect from a quad cab hemi. I am looking at a used 03 model. I currently have a regular cab with the 4.7 automatic. I am in the low 17's overall. most of my driving is to work which is open road, but i do spend some time in city driving as i live just outside a small town. Will i see a big difference. I had one guy tell me he was getting 13 city an 18 hwy in a hemi 4x4, is this acurate? I should be able to beat a 4x4 right? all help is appreciated.