Kia K4 vs. K5: Which Kia Sedan Is Right for You?
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The 2026 Kia K5 is the bigger, more powerful sedan with available all-wheel drive, while the 2026 Kia K4 earns better EPA-estimated fuel economy and gives rear passengers more legroom. • Size: The K5 is 7.7 inches longer, with a larger 15.6-cubic-foot trunk. • Power: The K5 makes 191 hp standard and 290 hp in the GT; the K4 makes 147 hp or 190 hp. • Fuel economy: The K4 is EPA-rated up to 33 MPG combined, versus up to 30 for the K5. • Rear legroom: The K4 offers 38.0 inches, compared with 35.2 inches in the K5. |
What Are the Kia K4 and Kia K5?
The Kia K4 is a compact four-door sedan, and the Kia K5 is a larger midsize sedan. Both are built by Kia, both come standard with front-wheel drive, and both put a big touchscreen and a full suite of driver-assistance features in every trim.
Most K4 and K5 sedans on our lot today are 2026 models, so this guide compares the 2026 Kia K4 and 2026 Kia K5 using Kia America's published specifications and EPA estimates. At Jenkins Kia of Crystal River, you can drive both back to back before you decide.
Kia K4 vs K5: What Is the Main Difference?
The main difference is size and power. The K5 is the longer, more powerful sedan with available all-wheel drive, while the K4 earns higher EPA-estimated fuel economy and offers more rear-seat legroom.
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2026 Spec |
Kia K4 |
Kia K5 |
|
Class |
Compact sedan |
Midsize sedan |
|
Length |
185.4 in. |
193.1 in. |
|
Wheelbase |
107.1 in. |
112.2 in. |
|
Standard engine |
2.0L, 147 hp, 132 lb-ft |
2.5L, 191 hp, 181.5 lb-ft |
|
Most powerful engine |
1.6L turbo, 190 hp, 195 lb-ft |
2.5L turbo, 290 hp, 311 lb-ft |
|
Drivetrain |
Front-wheel drive |
FWD; AWD on GT-Line |
|
EPA-est. combined MPG |
Up to 33 |
Up to 30 |
|
Rear legroom |
38.0 in. |
35.2 in. |
|
Trunk space |
14.6 cu. ft. |
15.6 cu. ft. |
|
Trims |
LX, LXS, EX, GT-Line, GT-Line Turbo |
LXS, EX, GT-Line, GT |
Specifications vary by trim and equipment. Confirm details on the window sticker of the specific vehicle you are considering.
Is the Kia K5 Bigger Than the K4?
Yes. The 2026 K5 is 7.7 inches longer than the K4, at 193.1 inches versus 185.4 inches, and its wheelbase is 5.1 inches longer. It is also slightly wider, at 73.2 inches versus 72.8 inches.
The extra length gives the K5 more room up front and a bigger trunk. The K4's shorter body is easier to park at busy spots around Crystal River and Inverness.
Which Sedan Has More Rear Legroom?
The K4 has more rear legroom. Kia lists 38.0 inches for the 2026 K4, compared with 35.2 inches in the K5. That gives the compact K4 a real advantage for anyone who carries adults or teens in the back seat.
The K5 answers with a larger trunk, at 15.6 cubic feet versus 14.6 cubic feet in the K4 sedan.
How Do the Engines Compare?
The K5 offers more power at every level. Its standard 2.5-liter four-cylinder makes 191 horsepower, and the K5 GT's 2.5-liter turbo makes 290 horsepower and 311 lb-ft of torque.
The K4 uses a 2.0-liter four-cylinder with 147 horsepower on the LX, LXS, EX and GT-Line. The GT-Line Turbo steps up to a 1.6-liter turbo with 190 horsepower and 195 lb-ft.
• K4 transmissions: An Intelligent Variable Transmission with the 2.0L, and an eight-speed automatic with the 1.6L turbo.
• K5 transmissions: An eight-speed automatic with the 2.5L, and an eight-speed wet dual-clutch transmission in the K5 GT.
Which Gets Better Gas Mileage, the K4 or K5?
The K4 gets better gas mileage. Most 2026 K4 trims carry an EPA estimate of 29 city, 39 highway and 33 combined MPG, and the GT-Line Turbo is rated at 26/33/28.
The 2026 K5 LXS is rated at 26 city, 37 highway and 30 combined MPG. Here is the full picture:
|
2026 Model (EPA est.) |
City |
Hwy |
Combined |
|
K4 LX, LXS, EX, GT-Line |
29 |
39 |
33 |
|
K4 GT-Line Turbo |
26 |
33 |
28 |
|
K5 LXS |
26 |
37 |
30 |
|
K5 EX and GT-Line FWD |
25 |
36 |
29 |
|
K5 GT-Line AWD |
24 |
33 |
27 |
|
K5 GT |
23 |
33 |
27 |
These are EPA estimates. Actual mileage varies with driving habits, weather and vehicle condition. For a wider look at efficient Kia models, see our top Kia MPG ratings blog.
Does the Kia K5 Come With All-Wheel Drive?
Yes. All-wheel drive is available on the 2026 K5 GT-Line. The rest of the K5 lineup and every K4 trim use front-wheel drive.
If AWD matters to you in a sedan, the K5 GT-Line is the model to test drive. For most Florida driving, front-wheel drive in either sedan handles daily commutes and rainy afternoons well.
How Do the K4 and K5 Trim Levels Line Up?
The 2026 K4 comes in five trims, and the 2026 K5 comes in four. Each lineup builds from an affordable, well-equipped base to a sporty top trim.
Kia K4 Trims
1. LX: The starting point, with the 147-hp 2.0L engine.
2. LXS: Adds more convenience and driver-assistance features.
3. EX: Adds more comfort and technology features.
4. GT-Line: Sporty styling and a multi-link rear suspension, with an available GT-Line Premium Package that adds ventilated front seats, a heated steering wheel and Harman Kardon audio.
5. GT-Line Turbo: The 190-hp 1.6L turbo, with an available Technology Package that adds Surround View Monitor and Digital Key 2.0.
Kia K5 Trims
1. LXS: The 191-hp 2.5L engine with front-wheel drive.
2. EX: Adds more comfort features to the LXS.
3. GT-Line: Sporty styling, with front-wheel drive or available AWD.
4. GT: The 290-hp turbo, with an available GT1 Package that adds Bose audio, ventilated front seats and Surround View Monitor.
Which Kia Sedan Is Right for You?
Both sedans deliver strong value and modern tech. The right one depends on how you drive.
Choose the Kia K4 if you want:
• Top fuel economy, with an EPA estimate of up to 33 MPG combined.
• More rear legroom for passengers.
• A smaller footprint for easy parking.
• A hatchback option, since the K4 is also offered as the K4 Hatchback.
Choose the Kia K5 if you want:
• More power, from 191 hp up to 290 hp in the K5 GT.
• Available all-wheel drive on the GT-Line.
• A larger trunk and a roomier front seat.
• A midsize sedan for long highway drives to Ocala, Tampa or Gainesville.
What About the 2027 Models?
Kia's 2027 K4 keeps the same engines, size and EPA ratings as the 2026 model. The 2027 K5 lists a 186-hp base engine and drops the EX trim, so ask our team to compare model years if you see both on the lot.
Test Drive the K4 and K5 at Jenkins Kia of Crystal River
The best way to choose is to sit in the back seat of each, then take them out on US-19. Browse our new Kia K4 inventory and our new Kia K5 inventory, or see our full new vehicle inventory. You can also value your trade before you visit.
Jenkins Kia of Crystal River is at 1850 SE US Hwy 19 and serves drivers from Crystal River, Beverly Hills, Lecanto, Inverness and Spring Hill. Call 352-739-7237 or contact us online to set up a side-by-side test drive.
About the Author
This guide was prepared by the sales and service team at Jenkins Kia of Crystal River, a Kia dealership at 1850 SE US Hwy 19, Crystal River, FL 34429. The dealership serves drivers from Crystal River, Beverly Hills, Lecanto, Inverness, Ocala, Spring Hill, Brooksville and Gainesville with new and used vehicle sales, financing and Kia service. Sales: 352-739-7237. Service: 352-651-7349.
References & Sources
1. Kia Media: 2026 Kia K4 Specifications — https://www.kiamedia.com/us/en/models/k4/2026/specifications (Engines, output, dimensions, legroom, trunk, EPA-estimated MPG, trims, GT-Line Premium and GT-Line Turbo Technology packages)
2. Kia Media: 2026 Kia K5 Specifications — https://www.kiamedia.com/us/en/models/k5/2026/specifications (191 hp and 181.5 lb-ft, GT 290 hp and 311 lb-ft, dimensions, trunk, EPA-estimated MPG by trim, GT-Line AWD, GT1 Package)
3. Kia Media: 2027 Kia K5 Specifications — https://www.kiamedia.com/us/en/models/k5/2027/specifications (2027 K5 186-hp base engine, trim lineup without EX, legroom)
4. Kia Media: 2027 Kia K4 Specifications — https://www.kiamedia.com/us/en/models/k4/2027/specifications (2027 K4 engines, size and EPA ratings unchanged from 2026)
5. Jenkins Kia of Crystal River: New Kia K4 inventory — https://www.jenkinskiaofcrystalriver.com/new-inventory/index.htm?model=K4 (Dealer K4 inventory (mostly 2026 models))
6. Jenkins Kia of Crystal River: New Kia K5 inventory — https://www.jenkinskiaofcrystalriver.com/new-inventory/index.htm?model=K5 (Dealer K5 inventory (mostly 2026 models))
7. Jenkins Kia of Crystal River: Contact — https://www.jenkinskiaofcrystalriver.com/contact.htm (Address and phone numbers)