The 2007 Kia Optima is available as a 4-door, 5-seat sedan. Starting at $19,395, the 2007 Kia Optima EX (A5) is powered by a 2.4L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 34-mpg on the highway. The top of the line 2007KiaOptimaLX (A5) , priced at $ 17,650 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 34-mpg on the highway.