The 2010 Chrysler 300 is available as a 4-door, 5-seat sedan. Starting at $30,475, the 2010 Chrysler 300 Touring/Signature Series/Executive Series RWD is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway. The top of the line 2010Chrysler300300S V6 RWD , priced at $ 31,885 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway.