Two Sedans with more similarities, such as the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the model year and horsepower. First of all, the is a newer vehicle by 3 model years. And finally, the 2016 Sonata Plug-in Hybrid pulls more horsepower than the 2013 Avalon Hybrid. Among similarities are the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy.