I have some pretty good experience with getting mileage in diesel trucks. I got 30.94mpg on one tank from Vegas to Los Angeles in my 97 Dodge....
1997 Dodge Ram 3500 Dualie Cummins - Diesel Power Magazine
and I routinley get mid-20s in my 89 on the freeway without really trying. A programmer that bumps timing REALLY will help in these trucks....also don't forget to run skinny tires at 80psi 
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1989 Dodge Diesel 972rwhp, 27mpg.
1971 Nova tubbed, solid cam 355 w/nitrous, 8mpg (sorry).
1960 Nash DIY Hybrid Project
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