Two Sedans with more similarities, such as the body structure, starting price, height, and maximum occupancy, than differences, like the horsepower, fuel economy, and ground shadow size. First of all, the 2015 Buick Verano has a more powerful engine than the 2016 Mazda 6, and it gets 5.8 fewer miles on a gallon of fuel. And finally, the 2015 Verano is slightly smaller than the 2016 6. Among similarities are the body structure, starting price, height, and maximum occupancy.