Two Pickups with more similarities, such as the body structure, ground shadow size, height, and maximum occupancy, than differences, like the fuel economy, starting price, and horsepower. First of all, the 2016 Ram 1500 Regular Cab is priced $3,495 lower compared to the base MSRP of the 2015 Nissan Titan King Cab. And finally, a bigger engine usually means less mpg. But the 2016 1500 Regular Cab has a more powerful engine and it gets 4.7 more mpg than the 2015 Titan King Cab. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.