Two Pickups with more similarities, such as the body structure, starting price, and fuel economy, than differences, like the horsepower, ground shadow size, height, and maximum occupancy. First of all, the 2016 Toyota Tacoma Double Cab produces fewer horsepower than the 2015 GMC Sierra 1500 Regular Cab. Also, the 2015 Sierra 1500 Regular Cab is both slightly larger and taller than the 2016 Tacoma Double Cab. And finally, the Sierra 1500 Regular Cab seats one more passenger than the Tacoma Double Cab. Among similarities are the body structure, starting price, and fuel economy.