The 2017 Chevrolet Sonic is a 4-door, 5-seat Sedan, available in 10 trims, ranging from the LS Manual Sedan to the Premier Auto Hatchback. Upon introduction, the $15,145 LS Manual Sedan is equipped with a standard 1.8L, 4-cylinder, engine that achieves 26-mpg in the city and 35-mpg on the highway. a Manual transmission is standard. The $21,215 Premier Auto Hatchback is equipped with a standard 1.4L, 4-cylinder, engine that achieves 27-mpg in the city and 37-mpg on the highway. an Automatic transmission is standard.