;This year saw the release of Chevy's first mid-size diesel model, the Colorado. It holds a 2.8-liter inline four turbodiesel. Look for it later this year. The Silverado comes bigger with a 6.6-liter Duramax V8 pumping 397-hp and 765 lb-ft of torque. This engine can get you as much as 20 mpg, compared to 11 or 12 from the gas fueled versions.

Ford F150 Super Duty

Ford is focused on its EcoBoost, turbocharged gasoline engines, but it does offer two diesel models in its F150 Super Duty line. One is a 6.7-liter Power Stroke V8 turbodiesel with 800 lb-ft of torque and 400-hp. Early reports show drivers averaging 15-16 mpg with the diesel compared to 13 mpg with gasoline models.

Nissan Titan

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Nissan announced a turbodiesel Titan with a 5-liter V8, with reports of over 300-hp and mid-500 lb-ft torque. Look for further news, because it may be the most fuel-efficient truck of the bunch.

RAM 1500 EcoDiesel

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After a long hiatus, RAM is releasing a light-duty diesel pickup. The 1500 EcoDiesel will have a 3.0-liter turbodiesel V6 that offers 240-hp and 420 lb-ft of torque. Chrysler promises "best-in-class" fuel efficiency from this model, and it may beat the Nissan's V8 on that mark. We will have to wait and see.

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