The 2008 Chevrolet Cobalt is available as a 4-door, 5-seat sedan. Starting at $14,410, the 2008 Chevrolet Cobalt LS Sedan 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 36-mpg on the highway. The top of the line 2008ChevroletCobaltSS Turbocharged Coupe , priced at $ 22,335 , is powered by a 2.0L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway.