Although we haven't had the chance to drive the all-new — for the U.S. — turbo-diesel 2.8-liter inline-four-cylinder baby Duramax yet, we did see what it will look like under the hood of a 2016 Chevrolet Colorado at the National Truck Equipment Association's 2015 Work Truck Show in Indianapolis. It was obvious from the crowds surrounding the midsize pickup truck much of the time that there are many potential small truck buyers who are curious about it. We managed to push our way to the front of the truck and talk about some of the key issues that are likely to determine this engine option's success.