Trims, Powertrain, and Fuel Economy

The 2025 Kia K4 is made in five trim levels: LX, LXS, EX, GT-Line, and GT-Line Turbo. The first four get the base powertrain, a 147-horsepower 2.0-liter four-cylinder engine with a CVT (Kia’s Intelligent Variable Transmission) and a front-wheel drivetrain. The zestier GT-Line Turbo is upgraded with a turbocharged 1.6 liter four-cylinder engine and an 8-speed automatic transmission with paddle shifters.

According to the EPA, the base LX returns an estimated 30 mpg in the city and 40 mpg on the highway, while the LXS, EX, and GT-Line achieve 29 mpg city/39 mpg highway. With its more robust engine, the GT-Line Turbo is rated for 26 city/36 highway.

Standard Amenities

Kia outfits the K4 with some attractive features for its debut model year. The entry-level LX comes with remote start, hands-free trunk access, proximity keyless entry, push-button ignition, heated power-adjustable exterior mirrors, fabric upholstery, air conditioning, a 4-inch gauge cluster, USB-C ports, auto on/off LED headlights, LED daytime running lights, and 16-inch steel wheels. The LXS adds a 60/40-split folding rear seatback and 16-inch alloy wheels, while the EX receives wireless phone charging, a leatherette-wrapped steering wheel and shift knob, dual-zone automatic climate control, the Kia Access app (for preheating and cooling the vehicle), a 12.3-inch digital gauge cluster, and 17-inch alloy wheels.

The GT-Line receives heated front seats, upholstery in a mix of cloth and SynTex simulated leather, gloss-black exterior elements, a 10-way power-adjustable driver’s seat, a sport-style steering wheel (with paddle shifters), a multi-link rear suspension, and 18-inch alloy wheels. The GT-Line stands at the top of the K4 range with full SynTex upholstery, LED projection headlights, LED fog lights, alloy sport pedals, a wide sunroof, and rear air-conditioning vents. Both GT-Line trims are eligible for mudguards and an auto-dimming rearview mirror with HomeLink. The GT-Line Turbo also qualifies for the Technology Package, which contains ventilated front seats, ambient mood lighting, position memory for the driver’s seat and exterior mirrors, Digital Key 2.0, and some additional driver-assist features (see the next section for details).

Safety and Driver-Assistance Tech

Every 2025 K4 has Kia Drive Wise installed. This comprehensive suite of advanced safety features consists of forward collision-avoidance assist (with pedestrian, cyclist, and junction turning detection), lane keeping assist, lane following assist, adaptive cruise control, rear occupant alert, and driver attention warning. The LXS and EX also include rear cross-traffic collision-avoidance assist, blind-spot collision warning with parallel exit assist, and safe exit warning. The two GT-Line trims add highway driving assist. The GT-Line equipped with the Technology Package will also get emergency rear braking, a surround-view monitor, a blind-spot view monitor, automatic emergency braking, and ultrasonic parking sensors (front, side, and rear).

Infotainment and Connectivity

The centerpiece of the ’25 K4 is a 12.3-inch touchscreen infotainment system featuring wireless Android Auto and Apple CarPlay, SiriusXM satellite radio, HD Radio, Bluetooth hands-free phone and audio streaming, and the Kia Connect app. While the LX comes with a four-speaker audio system, the LXS and EX are upgraded with an additional pair of speakers. The GT-Line and GT-Line Turbo add navigation and the Kia AI Assistant. The GT-Line Turbo gets a Harmon Kardon sound system with eight speakers (this is optional for the GT-Line).