2026 head-to-head · Large Car
2026 Hyundai Sonata vs Kia K5
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
The 2026 Hyundai Sonata is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas, it costs about $1,453 a year to fuel (32 MPG), versus $1,550 for the 2026 Kia K5 (30 MPG). That's roughly $97 a year, or about $484 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Hyundai Sonata
- Kia K5
Side by side
| Hyundai Sonata | Kia K5 | |
|---|---|---|
| $1,453 | Your annual fuel cost | $1,550 |
| 32 MPG | Combined efficiency | 30 MPG |
| 28 MPG | City | 26 MPG |
| 38 MPG | Highway | 37 MPG |
| 104 cu ft | Passenger volume | 105 cu ft |
| 16 cu ft | Cargo volume | 16 cu ft |
| 281 g/mi | Tailpipe CO₂ (g/mi) | 298 g/mi |
| 6/10 | EPA fuel economy score | 6/10 |
| 6/10 | EPA greenhouse gas score | 6/10 |
| Gas | Powertrain | Gas |
| Regular gasoline | Fuel | Regular gasoline |
| 2.5L 4-cyl | Engine / motor | 2.5L 4-cyl |
| 8-speed automatic | Transmission | 8-speed automatic |
| FWD | Drivetrain | FWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Hyundai Sonata vs Kia K5 across model years
- Hyundai Sonata
- Kia K5
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Among 24 2026 large cars, the Hyundai Sonata ranks 8th and the Kia K5 10th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2026 Hyundai Sonata or the 2026 Kia K5?
Measured by cost to drive, the Hyundai Sonata. The Hyundai Sonata is rated 32 MPG combined and the Kia K5 30 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2026 Hyundai Sonata vs. the Kia K5 per year?
At 15,000 miles a year with $3.10/gal regular gas, about $1,453 for the Hyundai Sonata and $1,550 for the Kia K5.
Hyundai Sonata vs Kia K5 in other years
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