The 2025 Kia K4 specs set themselves apart, with excellent fuel economy averaging 30 MPG in the city and 40 MPG on the highway. The K4 is a stylish new compact sedan that replaces the outgoing Forte , have a 147-hp 2.0-liter four-cylinder engine, front-wheel drive, and a continuously variable automatic transmission (CVT). Kia has kept the K4's interior design clean and simple, with a linear look to the dash. Although there's a large infotainment display, there are also still several physical buttons for controls, which is refreshing given the auto industry's push to digitize such things.