What we have here are two Sedans from Hyundai with some differences, such as the fuel economy, market segment, starting price, and horsepower. First of all, there is a $4,250 difference in the base MSRP. The 2015 Hyundai Sonata Hybrid has a higher starting price than the 2016 Hyundai Sonata. Also, the 2016 Sonata has bigger and thirstier engine; the 2015 Sonata Hybrid gets 9.9 more mpg. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.