The 2004 Kia Optima is available as a 4-door, 5-seat sedan. Starting at $15,900, the 2004 Kia Optima LX (M5) is powered by a 2.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 30-mpg on the highway. The top of the line 2004KiaOptimaLX (A4) , priced at $ 16,920 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway.