The Kia K4 does 33.5 mpg combined (29.5 city, 39.5 highway), which works out to about $1,146 a year in fuel at $3.20 a gallon and 12,000 miles. Against other 4-cyl cars it sits above the average of 25.4 mpg.
Every Kia K4 engine, compared
Picking the right version of the same car often saves more fuel than picking a different car altogether. 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
Miles per gallon is an abstraction; the fuel bill is not. Here it is in money, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Cost per mile | $0.096 |
| Fuel per year | $1,146 |
| Fuel over five years | $5,730 |
| Against other 4-cyl cars | −$366 a year |
| EPA's own estimate | $1,775 a year |
City or highway — who is this car for
The gap between city and highway figures tells you whom the car suits. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 29.5 mpg | $1,302 a year if you only drive in town |
| Highway | 39.5 mpg | $972 a year if you mostly commute |
| Gap | +10 mpg (34%) | Wide — this car dislikes traffic |
How the K4 changed over the years
Combined figure by model year. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| 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
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What mpg does the Kia K4 get?
33.5 mpg combined on average — 29.5 in the city and 39.5 on the highway, per EPA ratings across 2025–2026.
How much does a Kia K4 cost in fuel per year?
About $1,146 at 12,000 miles and $3.20 a gallon — roughly $5,730 over five years, or 0.096 dollars a mile.
Which K4 engine is the most economical?
The 2L 4-cyl at 33.5 mpg.
Is the K4 good on fuel compared with similar cars?
Against other 4-cyl cars it sits above the average of 25.4 mpg, computed across 6877 ratings.
Are these real-world figures?
No — they are EPA laboratory ratings, the same ones on the window sticker. Real consumption depends on driving style, terrain, load and weather, and is typically a little worse.