2027 head-to-head · Large Car vs Midsize Car
2027 Hyundai Sonata vs Kia K4
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 2027 Kia K4 is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas, it costs about $1,409 a year to fuel (33 MPG), versus $1,500 for the 2027 Hyundai Sonata (31 MPG). That's roughly $91 a year, or about $455 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 K4
Side by side
| Hyundai Sonata | Kia K4 | |
|---|---|---|
| $1,500 | Your annual fuel cost | $1,409 |
| 31 MPG | Combined efficiency | 33 MPG |
| 26 MPG | City | 29 MPG |
| 38 MPG | Highway | 39 MPG |
| 104 cu ft | Passenger volume | 99 cu ft |
| 16 cu ft | Cargo volume | 15 cu ft |
| 290 g/mi | Tailpipe CO₂ (g/mi) | 269 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 | 2.0L 4-cyl |
| 8-speed automatic | Transmission | CVT |
| 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 K4 across model years
- Hyundai Sonata
- Kia K4
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
Per EPA interior volume figures, the Hyundai Sonata has more passenger space (104 vs. 99 cu ft); the Hyundai Sonata has more cargo space (16 vs. 15 cu ft).
Frequently asked questions
Which is more fuel-efficient, the 2027 Hyundai Sonata or the 2027 Kia K4?
Measured by cost to drive, the Kia K4. The Hyundai Sonata is rated 31 MPG combined and the Kia K4 33 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2027 Hyundai Sonata vs. the Kia K4 per year?
At 15,000 miles a year with $3.10/gal regular gas, about $1,500 for the Hyundai Sonata and $1,409 for the Kia K4.
Which has more cargo space?
The Hyundai Sonata, with 16 cu ft of luggage volume versus 15 cu ft (EPA interior volume index).
More 2027 comparisons
Hyundai Sonata vs…
Or compare the 2027 Hyundai Sonata with anything else: