Two Pickups with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, there is a $3,385 difference in the base MSRP. The 2016 GMC Sierra 1500 Regular Cab has a higher starting price than the 2015 Chevrolet Colorado Crew Cab. Also, the 2016 Sierra 1500 Regular Cab has a more powerful engine than the 2015 Colorado Crew Cab, and it gets 1.5 fewer miles on a gallon of fuel. In addition, the Colorado Crew Cab body is slightly smaller than the Sierra 1500 Regular Cab, and in addition to that, it's also shorter. And finally, you'll seat one more passenger in the GMC Sierra 1500 Regular Cab than in the Chevrolet Colorado Crew Cab. Among similarities is the body structure.