The 2010 Chevrolet Cobalt is available as a 2-door, 5-seat coupe. Starting at $14,990, the 2010 Chevrolet Cobalt Base Coupe is powered by a 2.2L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 35-mpg on the highway. The top of the line 2010ChevroletCobaltLT Sedan , priced at $ 16,470 , is powered by a 2.2L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 25-mpg in the city and 37-mpg on the highway.