This sounds pretty interesting! Nissan announced that they are going to put a Cummins in their Titan.
"We have done our homework on the next-generation Titan. Truck owners told us there's a demand for the performance and torque of a diesel in a capable truck that doesn't require the jump up to a heavy-duty commercial pickup," Diaz said in a statement. "There is no question that the new Titan will turn heads, and with the available Cummins 5.0-liter V-8 turbo-diesel, we expect to win new fans and attract buyers looking for this unique configuration."
That would make for a nice 1/2 ton truck and probably get some decent fuel mileage since 1/2 ton trucks are required to use EPA mileage ratings.