The 2016 Mazda Mazda6 is a 4-door, 5-seat Sedan, available in 5 trims, ranging from the Sport (M6) to the Grand Touring (A6). Upon introduction, the $21,495 Sport (M6) is equipped with a standard 2.5L, 4-cylinder, engine that achieves 25-mpg in the city and 37-mpg on the highway. a Manual transmission is standard. The $30,195 Grand Touring (A6) is equipped with a standard 2.5L, 4-cylinder, engine that achieves 26-mpg in the city and 38-mpg on the highway. an Automatic transmission is standard.