Two Pickups with some similarities, but otherwise different in most aspects such as the horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2016 Ram 1500 Regular Cab has a more powerful engine than the 2015 Chevrolet Colorado Crew Cab, and it gets 1.8 fewer miles on a gallon of fuel. Also, not only 2015 Colorado Crew Cab is slightly smaller, but it's also shorter than the 2016 1500 Regular Cab. And finally, you'll seat one more passenger in the 1500 Regular Cab than in the Colorado Crew Cab. Among similarities are the body structure and starting price.