I have been looking for a new truck lately and i found two that i really like. They are both identical trucks just one has a 5.3 and 3.23's and the other has a 6.0 LQ9 and 3.73's. Both trucks are 05' extended cab LS and both have 20's. I was wondering what the difference would be in gas mileage between the two. I was hoping someone on here might have a truck similar to the ones i am looking at, particularly the one with the 6 liter. I have been leaning towards the 6.0 for the performance aspect but im worried about the mileage being are 13 like my brother inlaws hemi. I know dodges are dogs but thats all i have to compare to that has 345 horses. I was guessing 16-17 hwy with the 6.0? If anyone can give me an honest answer i would appreciate it.