There's no point in driving anything other than a 1 tonne diesel. Everything else is fake and gay. The fuel mileage in your diesel is pretty good once you take into account how much power you have at your disposal. Empty, my pic related gets 18mpg and, loaded, gets 11 mpg, a vast improvement over spark plug cucks. My favorite thing to do, pulling my 5000 lb travel trailer with a fully loaded pickup, is not let people pass me up hills. My King Ranch is clearly racial supremacy and it's stock. Literally don't have to know numbers. It's just better.
Having said all that, while I love the old generation 6.0, it has problems, and my 6.7 was far more reliable. Recently I just did injectors and I think I'll be doing the oil pump next. But, it is 14 years old with 170,000 miles and parts do wear out. Overall, it's strong as ever. Inb4 Cummins