Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, starting price, fuel economy, model year, market segment, and horsepower. First of all, the 2016 Cadillac XTS is priced $14,655 lower compared to the base MSRP of the 2014 Acura RLX Hybrid, which is older by two model years. Also, a bigger engine usually means less mpg. But the 2014 RLX Hybrid has a more powerful engine and it gets 11 more mpg than the 2016 XTS. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.