The 2017 Mazda Mazda3 is a 4-door, 5-seat Sedan, available in 13 trims, ranging from the Sport (A6) Sedan to the Grand Touring (M6) Sedan. Upon introduction, the $19,395 Sport (A6) Sedan is equipped with a standard 2.0L, 4-cylinder, engine that achieves 28-mpg in the city and 37-mpg on the highway. an Automatic transmission is standard. The $23,145 Grand Touring (M6) Sedan is equipped with a standard 2.5L, 4-cylinder, engine that achieves 25-mpg in the city and 34-mpg on the highway. a Manual transmission is standard.