The 2015 Kia Optima Hybrid is available as a 4-door, 5-seat sedan. Starting at $25,990, the 2015 Kia Optima Hybrid Base is powered by a 2.4L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 36-mpg in the city and 40-mpg on the highway. The top of the line 2015KiaOptima HybridEX , priced at $ 32,150 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 35-mpg in the city and 39-mpg on the highway.