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Just trade it in for an '04.5 to 06 Duramax, edge programmer, 4" cat back, bingo 20mpg...I get that almost every tank. 22.8 once but i pushed it into neutral alot for coasting!
As for NA diesel, they might work well in a certain rpm band, good for forklifts. ecomodding 101 is get up to speed then lug the engine, 4 seconds at 10mpg is better than 20 seconds at 10 mpg to get to the same speed. My trucks luggs along getting 30 mpg's after I get it up to speed.
My 4 cents
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