[Maverick684]

I have had my 05 since it was new and I pull a trailer everyday for my business although it is quite a bit lighter than yours roughly 3500lbs. fully loaded and i average about 11.5 to 12mpg's in the city and and about 15 on the highway. You could probably add about 3mpg's if the truck is unloaded to each of those. Also i would also lean towards the predator although I dont have one I have heard a lot of people that are very pleased with theirs. It also has some nice features like being able to read and clear trouble codes. PPE also has some nice programmers. The exhaust will defintely help lower your EGT's by roughly 150-200 degrees at peak throttle, a pyro would also be good so you can watch if your right foot is getting a little heavy.