Two SUVs with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the model year, starting price, horsepower, and fuel economy. First of all, the 2016 Acura RDX is priced $4,290 lower compared to the base MSRP of the 2013 Lexus RX 350, which is older by three model years. And finally, a bigger engine usually means less mpg. But the 2016 RDX has a more powerful engine and it gets 2 more mpg than the 2013 RX 350. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.