The 2016 Chevrolet Sonic is a 4-door, 5-seat Sedan, available in 14 trims, ranging from the LS Manual Sedan to the RS Auto Hatchback. Upon introduction, the $14,345 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 $21,495 RS Auto Hatchback is equipped with a standard 1.4L, 4-cylinder, engine that achieves 25-mpg in the city and 33-mpg on the highway. an Automatic transmission is standard.