The writers over at Green Car Reports managed to get behind the wheel of a Nissan Frontier equipped with the same diesel that was in the concept vehicle shown at the 2014 Chicago Autoshow, their write-up can be found here.
The 2.8 litre diesel engine is supposed to have a 35% improvement on fuel economy over the comparable V6 gasoline engine. They noted that there were a few rough edges on truck as it is basically a normal Frontier with the diesel engine stuffed inside. The 2.8 litre diesel is paired up with an eight-speed ZF automatic transmission.
One of the complaints that was noted was that to get the most performance out of the engine that the turbo had to be kept spooled up by driving with a heavier than normal foot, fuel economy would suffer, but more of the power was available. The Volkswagen Amarok avoids this to some degree by having a bi-turbo design. One turbo for the lower portion of the power band and another for the upper range, over all the VW solution does a better job dealing with the problem of turbo lag.