2026 Kia K4 — Full Specifications
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The 2026 Kia K4 is a saloon/sedan offered with 2 engines (1.6L 4-cyl turbo, 2L 4-cyl). Its most fuel-efficient configuration returns around 40 mpg (UK) / 33 mpg (US EPA) combined, with 34–40 mpg (UK) across all configurations. Owners often keep a Kia K4 workshop manual to hand for servicing and repairs.
Compared with the 2025 Kia K4: Fuel economy is essentially unchanged at around 40 mpg (UK) combined. The engine line-up listed by EPA is unchanged. It carries the same 5★ overall NHTSA rating.
Full Specifications
| Engine (most efficient) | 2L 4-cyl |
|---|---|
| Engine options | 1.6L 4-cyl turbo · 2L 4-cyl |
| Transmission (most efficient) | Automatic (AV-S1) |
| Fuel Type | Regular Gasoline |
| Powertrain | Conventional |
| Drive | Front-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 99 cu ft (2,803 L) |
| Luggage Volume (EPA) | 15 cu ft (425 L) |
| Fuel Economy (UK) | 40 combined / 35 urban / 47 extra-urban mpg |
| Fuel Economy (US EPA) | 33 combined / 29 city / 39 highway mpg |
| CO₂ Emissions | 167 g/km |
| EPA Greenhouse Gas Score | 6 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $2,050 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2026 Kia K4 across 2 engines (1.6L 4-cyl turbo, 2L 4-cyl). Combined fuel economy ranges from 28 to 33 mpg (US), or 34 to 40 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 1.6L 4-cyl turbo | Automatic (S8) | Front-Wheel Drive | 34 | 28 (26/33) | 195 | $2,400 |
| 2L 4-cyl | Automatic (AV-S1) | Front-Wheel Drive | 40 | 33 (29/39) | 167 | $2,050 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
EPA measures interior passenger volume at 99 cubic feet (about 2,803 litres) and luggage volume at 15 cubic feet (about 425 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2026 Kia K4
Running Costs: 2026 Kia K4
Covering around 8,000 miles a year in a 2026 Kia K4 at 40 mpg combined, expect roughly 909 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $2,050 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2026 Kia K4 Safety Ratings (NHTSA)
Recalls & Owner Complaints (NHTSA)
NHTSA lists no safety recall campaigns for the 2026 Kia K4 as of 6 October 2026. Recalls can be issued years after a model is sold, so it is still worth checking your own VIN.
Owners have filed 12 complaints with NHTSA about the 2026 Kia K4. The most-reported areas are Steering (5), Unspecified (5), Lane departure (4). Complaints include 6 reported crashes, 1 reported injury.
Used-buyer checklist for the 2026 Kia K4
Based on where NHTSA recalls and owner complaints cluster for this model year, these are the areas worth checking before you buy:
- Steering (5 owner complaints) — Check for play, noise or heavy steering, and ask whether any steering recall work was done.
- Throttle & cruise control (2 owner complaints) — Check throttle response and cruise control are smooth, and ask about any software or throttle recalls.
Source: US NHTSA recall and consumer-complaint databases, retrieved 6 October 2026. Complaints are unverified owner reports, not confirmed defects. Check any vehicle by VIN at nhtsa.gov/recalls, and see our guide to checking a used car for recalls.
How It Compares
Kia models in our database average about 34 mpg (UK) combined on their most efficient configuration; the 2026 Kia K4's 40 mpg is 6 mpg above that make average. Its 167 g/km CO₂ figure is 40 g/km lower than the 207 g/km Kia average.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2026 Kia K4
Frequently Asked Questions
What engine does the 2026 Kia K4 have?
EPA lists 2 engines for the 2026 Kia K4: 1.6L 4-cyl turbo, 2L 4-cyl. The most fuel-efficient configuration pairs the 2L 4-cyl with a automatic (av-s1).
What is the fuel economy of the 2026 Kia K4?
The most efficient configuration returns around 40 mpg (UK) combined, or 33 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 34 to 40 mpg.
How much does the 2026 Kia K4 cost to fuel per year?
The US EPA estimates about $2,050 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
Does the 2026 Kia K4 have a good safety rating?
It holds an overall NHTSA rating of 5 stars, with 4 stars for frontal crash protection.
Does the 2026 Kia K4 have any recalls?
NHTSA lists no safety recall campaigns for the 2026 Kia K4 as of 6 October 2026. Recalls can be issued years after a model is sold, so it is still worth checking your own VIN.
What are the most common problems reported for the 2026 Kia K4?
Among the 12 owner complaints filed with NHTSA, the most-reported areas are Steering (5 complaints), Unspecified (5 complaints), Lane departure (4 complaints). Complaints are unverified owner reports, not confirmed defects, and raw counts rise with how many cars were sold.
How much interior and luggage space does the 2026 Kia K4 have?
EPA measures interior passenger volume at 99 cubic feet (about 2,803 litres) and luggage volume at 15 cubic feet (about 425 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.