The 2008 Kia Optima is available as a 4-door, 5-seat sedan. Starting at $19,895, the 2008 Kia Optima EX (A5) is powered by a 2.4L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 31-mpg on the highway. The top of the line 2008KiaOptimaLX (A5) , priced at $ 18,150 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 31-mpg on the highway.