Clown,
I have an '03 F-250 crew cab 4x4 with the 6.0 in it and I have not had any problems with the truck. I have had it since April 27th, and I have 26,500 miles on the truck. On the freeway at 70mph I get 22mpg and around town I average between 17-19mpg depending on how I drive it. Right now my truck is all stock and even stock I love it. Been thinking about lifting it for a while, just have to sack up and do it. The truck can tow my boat fully loaded up Cajon pass on cruise at 75mph and not have any problems. I had an 02 GMC 4x4 with the duramax before this truck and I am glad that I switched.