The 2018 Kia Optima Hybrid is available as a 4-door, 5-seat sedan. Starting at $25,995, the 2018 Kia Optima Hybrid Premium is powered by a 2.0L , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 39-mpg in the city and 46-mpg on the highway. The top of the line 2018KiaOptima HybridEX , priced at $ 30,990 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 39-mpg in the city and 46-mpg on the highway.