The 2016 Chevrolet Sonic is available as a 4-door, 5-seat sedan. Starting at $14,345, the 2016 Chevrolet Sonic LS Manual Sedan is powered by a 1.8L , 4 -cylinder engine that returns an EPA estimated 26-mpg in the city and 35-mpg on the highway. The top of the line 2016ChevroletSonicRS Auto Hatchback , priced at $ 21,495 , is powered by a 1.4L , 4 - cylinder engine that returns an EPA estimated 25-mpg in the city and 33-mpg on the highway.