I currently have 4 2007 HD 3500 4x4 4 doors autos w/373 gears Chevy diesels, one is a dually. One of the four also doubles as my daily driver. I have never avg more than 16mpg with any of them. They all pull trailers. heavest trailer is 16k. I also use mine to haul farm tractors. Heavest tractor is a Oliver 2050 @ 12k-14k alone. Anyway after I learned the hard way to stay away from biodiesel in the winter (all 4 shut down and not running/ all from different fuel stations) the trucks have been good. I am tired of looking for fuel out in the middle of nowwhere and I am thinking of getting a new F350 srw 4x4 with the new 6.2 gas. I can only get 373 for some reason the factory will not supply 355 gears. Has anyone else got this setup? If so what are you getting for mpg? I was hoping to get 12mpg. I do not see the reason to pay more for the diesel engine, and then pay more for the fuel. I do get a break on diesel fuel due to the amount we use in a month (fleet 100 trucks).