Business has been growing for me, and I want my operation to be as professional as possible. I am retiring my regular cab f250 5.4 and buying a new truck. I want a crew cab 3/4 or 1 ton truck that looks very sharp and I am going with a diesel. I have been out of the diesel truck game for a about a year and I am having trouble deciding what to get. I want to keep it around 20,000 and I want to get the best fuel economy possible. I know the 2003/2004 6.0 Powerstrokes have major issues with the egr, head bolts, fuel economy, etc. I can get a 2003 7.3, which is a solid motor with plenty of power and awesome efficiency. The only downside is the fact that it is a 7 year old truck. I can also get a 2005/2006 Chevy/GMC Duramax, but I don't know a lot about their true fuel efficiency. I used to hop out of our 7.3 and drive a company Duramax and it would blow my mind that it was a diesel since it is so much quieter, so it is definitely at the top of my list. I don't want another truck that gets 15 mpg. I am hoping that the next truck will get a little bit better. Are the later model 6.0's decent engines with all the updates? From what I have heard the 6.4's fuel efficiency is definitely not the best. I don't want to know about the economy of super chipped out diesels. Just some real world experience from daily drivers.