dodge has brought out the 1500's with a eco-diesel, 24 mpg from a full sized 4x4, BTW this is what I drive
'03 5.9 CTD 24 valve, 6 speed manual, averages right around 20 mpg running empty
RR
edited to add: reports are that Nissan is bringing out a cummins powered frontier (midsize truck) in 2015