Two Pickups with more similarities, such as the body structure, starting price, height, and maximum occupancy, than differences, like the model year, horsepower, fuel economy, and ground shadow size. First of all, the 2016 F-150 Regular Cab has a more powerful engine than the 2013 Sierra 1500 Extended Cab, but it gets 3.5 more miles on a gallon of fuel. Also, the body structure of F-150 Regular Cab is slightly smaller than that of the Sierra 1500 Extended Cab. Among similarities are the body structure, starting price, height, and maximum occupancy.