Against 381 other 4-cyl cars rated 2024–2026, the K4 beats their 26.3 mpg average by 6.7 mpg, about $296 a year.
Every Kia K4 engine, compared
The Kia K4 was rated in a single specification, so its gas mileage does not vary by version — only by model year. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl | 29.5 / 39.5 | 2025–2026 | $1,146 |
What that actually costs
Against its rivals in the same model years, the Honda Accord gets 40 mpg, the Lexus LS 22.7 mpg and the Toyota Crown 41 mpg, next to 33 mpg for the 2026 K4.
| Measure | Value |
|---|---|
| Cost per mile (2026) | $0.097 |
| Fuel per year | $1,164 |
| Fuel over five years | $5,820 |
| Against other 4-cyl cars, 2024–2026 | −$296 a year |
| EPA's own estimate | $1,875 a year |
City or highway — who is this car for
The 2026 Kia K4 gives up 10 mpg in town: 39 on the highway against 29 in the city, $339 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2026) | 29 mpg | $1,324 a year if you only drive in town |
| Highway | 39 mpg | $985 a year if you mostly commute |
| Gap | +10 mpg (34%) | Wide — this car dislikes traffic |
How the K4 changed over the years
The K4 peaked in 2025 at 34 mpg (30 city, 40 highway) and was at its thirstiest in 2026 at 33 — 1 mpg apart, or $35 a year in fuel between buying one year and the other. The 2026 car does 33.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2026 | 29 / 39 | 1 | $1,164 | |
| 2025 | 30 / 40 | 1 | $1,129 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 2 EPA ratings of the Kia K4 — 1 engine across 2025–2026. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $1,875. Full method.
Frequently asked questions
What mpg does the 2026 Kia K4 get?
33 mpg combined, 29 city and 39 highway, per EPA. Across every year since 2025 the K4 has averaged 33.5 mpg.
Is the 2026 K4 more efficient than the 2025?
No: 33 against 34 mpg combined, about $35 a year more to run.
Does the K4 get better gas mileage than the Honda Accord?
No: 33 mpg for the 2026 K4 against 40 for the 2026 Honda Accord, about $204 a year more to run.
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