You can be sure that these are impressive ratings to say the least, and it would also send the 2016 Chevrolet Colorado Diesel right to the very top of the list where the most fuel-efficient pickups in the US are concerned. It has competitors too, such as the Ram that while being larger than the mid-size Colorado, can still eke out 20 mpg city and 28 mpg highway with rear-wheel-drive, while the HFE (high fuel economy) models will have better performance of 21 mpg city and 29 mpg highway.
The delay in releasing EPA ratings was partly due to the VW emissions scandal that caused regulatory bodies to take a closer look at the diesel engines that pass through their labs, and it looks like everything is in order for the house of Chevrolet.