Two SUVs with some similarities, but otherwise different in most aspects such as the maximum occupancy, starting price, horsepower, fuel economy, ground shadow size, and height. First of all, the 2015 Toyota Highlander is priced $5,605 lower compared to the base MSRP of the 2016 Acura RDX. Also, although the 2016 RDX has a more powerful engine than the 2015 Highlander, it gets 1.5 more mpg. In addition, not only RDX is slightly smaller, but it's also shorter than the Highlander. And finally, there is a difference in the number of passengers; the Toyota Highlander seats three more the Acura RDX. Among similarities is the body structure.