I think Ford picked the 7.3 liter displacement to capitalize on the reputation of the old 7.3 Diesel. It sounds like it's built very stout and should preform well. Will be interesting to see what it does in the real world for mpg and performance. My 19 year old V-10 manual transmission is still going strong after 200k miles. I just took it on a 800 mile trip last weekend (solo) and averaged 13.75 mpg.