Dang! Now I don't know what to do on the whole issue. Before I bought the 2007 6.0, I had the 1999 7.3. I drove it until I had 89,000 on it. The only thing I ever bought for it was batteries and filters. Got good mileage-18mpg and it would pull my gooseneck cattle trailer as if it were not there.
I traded for the 6.0 and have had it in the waranty Ford shop 2 times in 9 months. Turbo work, EGR work and injector replacement. I only have 29,975 miles on it and
never thought it would have this kind of engine problems with no abuse of driving.
Before the 1999 7.3, I had the 460 gas engine and it had terrible gas mileage with or with out pulling a trailer.