As much as I love the reliability and proven history of the Cummins power plant, my honest opinion on the Ford 6.7L Scorpion is the they did an amazing job of building an emissions friendly diesel. I think it is the best offered to us yet.

One feature I really like about the scorpion is the new EGR design. The EGR is routed through over 3 feet of EGR cooling chambers and then routed through the inter-cooler. Pure genius! By the time the EGR gases have reached the engine they are the same temperature as the ambient air coming through the intake.

I also like the fact that they went with 14mm head studs. I have read the engine build schematics several times and it just amazes me some of the things the Swedish engineers came up with to fix Navistars previous mistakes. I really think they got this one right.

I have personally ridden in a buddies truck that was getting 20+ miles to the gallon on our way over to the coast, he also dynoed 383 horse power with a bone stock 6.7L scorpion that day at the dyno event we went to.

I guess my only advise would be to wait a few years and see if they have any major issues. The one thing that makes me nervous is all the damned sensors that Ford insists on using. From my experience in the past 5 years of working on Powerstrokes the sensors are 9 times out of 10 the things that go out and then cause a whole string of issues.

I hope this helps you make a good decision!