How much weight will you be hauling? Alot of people think they need a diesel and really don't. I've got an 02 3/4 ton with the 6.0 gas that pulls my 28ft fifth wheel #8000 pound trailer with no problems. I'm also gonna pull a trailer behind the fifth wheel for the bikes since I'm rated to pull 10,300. I get 15mpg unloaded and between 8-9 pulling the fifth wheel. I was thinking about a diesel too, but I'm not convinced that the extra cost is worth it. Gas is cheaper and the maintence is cheaper for gas too. Just my .02.