I have done the numbers, but I wouldn't expect a drastic difference. The motor is small, doesn't require a ton of oil. The only extra costs considered are the fuel filters as they are the life of a diesel. Most people don't change the fuel filters on a gas truck as much as a diesel.
Looks like Ford decided to try and hurt the EcoDiesel says with this new engine. A 2.7L EcoBoost with estimated 30 MPG will put it right there with the Ram Ecodiesel on mileage figures. What do you guys think? The truck is 700lbs lighter also. That has to help with fuel economy.