Two Sedans with more similarities, such as the body structure, powertrain, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, horsepower, and fuel economy. First of all, there is a notable difference in the starting price of the 2017 Acura RLX Hybrid, which is $15,145 less than the base MSRP of the 2017 Cadillac CT6 Hybrid. And finally, a bigger engine usually means less mpg. But the 2017 RLX Hybrid has a more powerful engine and it gets 3 more mpg than the 2017 CT6 Hybrid. Among similarities are the body structure, powertrain, market segment, ground shadow size, height, and maximum occupancy.