K4 or K5: Which Is Better for Knoxville Drivers?

Commuters throughout eastern Tennessee are drawn to vehicles that make zipping in and out of traffic effortless, as well as fuel efficient, allowing them to extend time in between those pesky stops to the gas station. Fortunately, there are commute-capable vehicles out there that can help make the most of your everyday journey down I-75—and when you want a commuter that’s affordable, efficient, and easy to handle, a sedan is your best bet.

Kia has an exquisite lineup of ready-for-anything vehicles, and if you’re interested in a sedan, we have a couple in mind. As your top Kia dealer in Knoxville, Rusty Wallace Kia of Knoxville is ready to help you get inside a vehicle that’s geared toward your commute. From West Knoxville to Karns and beyond, drivers everywhere will love these options and what they bring to your ride. So, what are they?

They’re the compact K4 and the midsize K5—two models that are ready to offer you the experience you need while you travel past the University of Tennessee. So, should you pick the K4 or K5? Let us help you decide.

Size Differences

The K4 is an all-new model for 2025, replacing the compact Forte, which has had a long run with the Kia brand. A compact sedan with a big attitude, the K4 offers drivers excellent handling, an affordable price point, and plenty of features designed to impact the daily drive down Route 11 in all the right ways.

It’s small, which means that it’s a breeze to drive, and it gets to take advantage of all those compact parking spaces throughout the city. You may presume that it’s too small to be comfortable, but this would be an incorrect assumption, seeing as the K4 offers class-leading second-row legroom, which means you’re able to bring along a couple of companions with ease.

Compact sedans aren’t for everyone, and if you find yourself in need of more space as you travel through West Knoxville, the midsize K5 may be more in tune with your demands. Not only can you expect more legroom on board for all, with 105.2 cu.ft. of passenger space, but the K5 also offers more places to stow all of your must-have travel belongings. With up to 16 cu.ft. in its trunk, compared to the K4’s 14.6 cu.ft. capacity (which still isn’t bad), the K5 offers a bit more space throughout to accommodate you and everything joining you on your ride.

Powertrain Expectations

You’ll also notice that there’s a difference when it comes to the engine selection you have in each model. The all-new K4 can be armed with either a 2.0L four-cylinder engine that’s paired with a continuously variable transmission (CVT) or a more exciting 1.6L turbocharged four-cylinder that’s paired with an eight-speed automatic transmission. The latter allows you to shoot forward with 190 hp, making for a livelier ride.

As a compact sedan, you can expect the K4 to offer incredible fuel economy ratings due to its small size, and this Kia newcomer doesn’t disappoint. Able to get an EPA-estimated 40 MPG on the highway, the K4 is an outstanding pick for Knoxville drivers who need to harness absolute efficiency as they’re sailing past the Sunsphere.

In the K5’s powertrain arsenal, you’ll find slightly different offerings, and if you want a bit more power out of your vehicle, the midsize K5 delivers. It comes standard with a 2.5L four-cylinder that’s paired with an eight-speed automatic transmission, while a turbocharged version is available, granting an impressive 290 hp that really reinvigorates your ride.

This extra power comes at a slight price, though, affecting fuel efficiency, with the standard engine getting an EPA-estimated 37 MPG on the highway and the turbocharged option getting up to 33 MPG on the highway. All things considered, this isn’t much of a discrepancy and may be worth it for a bit more power on the road.

Trim Level Lineups

You’ll find a nice lineup of trims available for both the K4 and K5. There’s something for every Karns traveler without being too overwhelming, which is much appreciated by drivers these days. The K4’s top-level trim is the GT-Line, which showcases sporty styling and handling to make the drive past Zoo Knoxville more compelling than ever. With paddle shifters, a multi-link rear suspension, and SynTex seat trim, you’ll be in for an engaging ride inside this energized trim.

You’ll also find a set of mid-level trims to enhance any type of journey, including the EX and LXS, which showcase features like premium cloth appointments, chrome accents, and plenty of sophisticated tech to elevate your time on the road. Even its entry-level LX trim is impressive, offering top tech features, like wireless smartphone capabilities, LED lighting elements, and stunning designer elements to make a statement on I-40.

The K5’s lineup is slightly different, with the top-of-the-line EX trim boasting features like black SynTex seat trim, a 10-way power-adjustable driver’s seat, and a heated steering wheel to keep you cozy on a chilly winter morning. You’ll also find the mid-level GT and GT-Line, which offer various features to intensify the ride, like neon green brake calipers, a sport-tuned suspension, and dynamic designer elements to add an athletic flair to your journey.

Comparing the Ride

From a pleasantly roomy interior to plenty of high-quality appointments surrounding you, a ride through Knoxville in the K4 will be more comfortable than ever. An available ultra-wide sunroof provides you with an open feeling as you sail through the Market Square district, while an available digital cockpit provides you with up to 30 inches of display space to access all of your must-have driving tech and more. Plus, with 11 standard safety features, you won’t have to worry about the quality or security of your ride; the K4 will be watching out for you at every turn.

The K5 offers more space, power, and capabilities than the K4, which makes this midsize sedan a great choice for many different West Knoxville drivers. While the K4 offers a bit more efficiency, the K5 is able to be armed with all-wheel drive capabilities, which allows you to experience optimal traction and stability whether you’ve hit a rough patch on the highway or you’re dealing with a bout of bad weather.

For 2025, you can expect various enhancements to its exterior, including revamped lighting elements, grille, and fascia design, as well as new wheel options, available in 16-, 18-, and 19-inch varieties. Its standard powertrain has been enhanced as well, now showcasing the aforementioned 2.5L four-cylinder, adding a boost of excitement to your ride. Many of the same features as what’s found in the K4 can be found in the larger K5, including an immersive display experience, premium seating elements, and unbeatable safety equipment.

The K4 or K5—Which Should You Choose?

If you want to make your time traveling through Knoxville, West Knoxville, Karns, and beyond more satisfying than ever, both the K4 and K5 offer a wonderful experience. Those who are searching for a car that’s effortless to handle, fits into any size parking space, and is great on gas will love the affordable K4; those who need a bit more space, want to take advantage of all-wheel drive capabilities, and desire more power during their drive will be drawn to the midsize K5.

The choice is up to you, but both offer exceptional reliability to your ride, as well as the nation’s best warranty, making it easy to trust in a Kia to get you to all the places you need to be in Knox County.