Two SUVs with some similarities, but otherwise different in most aspects such as the model year, starting price, horsepower, fuel economy, ground shadow size, and height. First of all, the 2013 Toyota 4Runner is priced $3,880 lower compared to the base MSRP of the 2016 Acura RDX, which is newer by three model years. Also, a bigger engine usually means less mpg. But the 2016 RDX has a more powerful engine and it gets 4 more mpg than the 2013 4Runner. And finally, the RDX body is slightly smaller than the 4Runner, and in addition to that, it's also shorter. Among similarities are the body structure and maximum occupancy.