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Formerly the domain of heavy-duty pickups, diesel engines are slowly creeping into smaller trucks. Ram arguably started the most recent trend with the 1500's 3.0-liter EcoDiesel V6. General Motors sells diesel-powered Chevrolet Colorados and GMC Canyons. Now, the Ford F-150 is getting in on the action with a 3.0-liter V-6 turbodiesel of its own...