The base 2.4L inline-4 engine in the 2015 kia optima engine generates around 192 horsepower and 181 lb-ft of torque, providing smooth acceleration and steady power for everyday driving. This engine is known for its dependability and fuel efficiency, attaining roughly 24 mpg in the city and 35 mpg on the interstate. The 2.4L engine is quick and ideal for commuters searching for a dependable sedan with ample power for smooth interstate merging and city driving.