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, a bigger engine usually means less mpg. But the 2016 Nissan Altima has a more powerful engine and it gets 2.5 more mpg than the 2015 Toyota Camry. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.