Kia K4 Annual Fuel Cost
Running a 2026 Kia K4 costs about $1,800 per year in fuel, based on 15,000 miles of driving at average U.S. fuel prices.
Latest model year (2026):
The Kia K4 costs an estimated $1,850/year in fuel (267 g CO₂/mi).
Kia K4 Fuel Cost — All Years
| Year | Trim | Engine | Fuel | MPG Comb. | Annual Cost | CO₂ (g/mi) | GHG Score |
|---|---|---|---|---|---|---|---|
| 2026Config 1 of 5 | Auto (AV-S1), 4 cyl, 2.0 L | 4 2.0L | Regular Gasoline | 33 | $1,850 | 267 | 6 |
| 2026Config 2 of 5 | Auto (AV-S1), 4 cyl, 2.0 L | 4 2.0L | Regular Gasoline | 33 | $1,850 | 269 | 6 |
| 2026Config 3 of 5 | Auto (AV-S1), 4 cyl, 2.0 L | 4 2.0L | Regular Gasoline | 30 | $2,050 | 289 | 6 |
| 2026Config 4 of 5 | Auto (S8), 4 cyl, 1.6 L | 4 1.6L | Regular Gasoline | 28 | $2,200 | 314 | 5 |
| 2026Config 5 of 5 | Auto (S8), 4 cyl, 1.6 L | 4 1.6L | Regular Gasoline | 28 | $2,200 | 314 | 5 |
| 2025Config 1 of 3 | Auto (AV-S1), 4 cyl, 2.0 L | 4 2.0L | Regular Gasoline | 33 | $1,850 | 273 | 6 |
| 2025Config 2 of 3 | Auto (AV-S1), 4 cyl, 2.0 L | 4 2.0L | Regular Gasoline | 34 | $1,800 | 264 | 7 |
| 2025Config 3 of 3 | Auto (S8), 4 cyl, 1.6 L | 4 1.6L | Regular Gasoline | 29 | $2,100 | 303 | 6 |
Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.
Kia K4 data analysis
How Kia K4 estimated annual fuel cost varies
Across 8 configurations recorded for the 2025 through 2026 Kia K4, estimated annual fuel cost runs from $1,800 to $2,200. The strongest figure belongs to the 2025 Kia K4 (Auto (AV-S1), 4 cyl, 2.0 L) at $1,800, and the weakest to the 2026 car (Auto (S8), 4 cyl, 1.6 L) at $2,200 — a spread of 18%. The narrow spread means any year of the Kia K4 in this table behaves much like the others, so you can shop on price, condition and mileage rather than chasing a particular model year.
What changed for 2026
Average estimated annual fuel cost for the 2026 Kia K4 is $2,030, against $1,917 for the 2025 car — it rose by $113. Buyers who care most about this figure should look at the earlier model years in the table above before assuming newest is best.
How to read this Kia K4 data
This page lists every 2025 through 2026 Kia K4 record we hold for this measurement — 8 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.
Configurations behind these Kia K4 numbers
The 2025 through 2026 Kia K4 entries here cover the variants Auto (AV-S1), 4 cyl, 2.0 L and Auto (S8), 4 cyl, 1.6 L. 2026 is the busiest model year in the record with 5 separate measured configurations, which is why a single quoted estimated annual fuel cost figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.
Where these Kia K4 figures come from
Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The Kia K4 record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.
Frequently Asked Questions About K4 Fuel Cost
How much does it cost to fuel the Kia K4?
The estimated annual fuel cost for the Kia K4 is $1,800 per year, based on 15,000 miles of driving and average fuel prices. Costs vary by trim and engine.
How much CO₂ does the Kia K4 produce?
The Kia K4 produces approximately 264 grams of CO₂ per mile. Lower numbers mean fewer emissions. See the table for per-trim details.
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