Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the horsepower and fuel economy. And finally, although the 2016 Nissan Altima has a more powerful engine than the 2015 Subaru Legacy, it gets 2.5 more mpg. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.