The 2017 Chevrolet Sonic is available as a 4-door, 5-seat sedan. Starting at $15,145, the 2017 Chevrolet Sonic LS Manual Sedan is powered by a 1.8L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 33-mpg on the highway. The top of the line 2017ChevroletSonicLT Auto w/1FL Hatchback , priced at $ 16,895 , is powered by a 1.8L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 34-mpg on the highway.