The kia optima 2.4 engine in the Kia Optima provides a pleasant driving experience with steady power for both city and interstate driving. Fuel efficiency is a strong strength, with an EPA-estimated 24 mpg in the city and 35 mpg on the interstate, making it an affordable option. The engine's architecture minimises noise and vibration, resulting in a comfortable ride in stop-and-go traffic or at cruising speeds.