Last month I purchased an 06' F350 regular cab, 8ft bed, diesel. I know the engine needs to get broken in first before I see optimum performance and optimum gas MPG, but I am currently averaging 8.85mpg which I think is horrible, My dump truck does better than this. My truck just broke 1,500 miles so I'm going to keep checking it and keep my fingers crossed. What are you guys averaging with your 6.0 ford diesels???