2027 head-to-head · Midsize Car
2027 Hyundai Ioniq 6 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.
AWD · Electric motors (448 kW) · Single-speed · 88 MPGe · 245 mi
The 2027 Hyundai Ioniq 6 is the cheaper one to run. Driving 15,000 miles a year with 18¢/kWh electricity and $3.10/gal regular gas, it costs about $1,023 a year to fuel (88 MPGe), versus $1,409 for the 2027 Kia K4 (33 MPG). That's roughly $386 a year, or about $1,929 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 Ioniq 6
- Kia K4
Side by side
| Hyundai Ioniq 6 | Kia K4 | |
|---|---|---|
| $1,023 | Your annual fuel cost | $1,409 |
| 88 MPGe | Combined efficiency | 33 MPG |
| 93 MPGe | City | 29 MPG |
| 82 MPGe | Highway | 39 MPG |
| 37.9 kWh | Electricity use (kWh/100 mi) | — |
| 245 mi | Driving range | — |
| 103 cu ft | Passenger volume | 99 cu ft |
| 11 cu ft | Cargo volume | 15 cu ft |
| 0 g/mi | Tailpipe CO₂ (g/mi) | 269 g/mi |
| 9/10 | EPA fuel economy score | 6/10 |
| 10/10 | EPA greenhouse gas score | 6/10 |
| 9.1 hrs | Charge time at 240V | — |
| Electric | Powertrain | Gas |
| Electricity | Fuel | Regular gasoline |
| Electric motors (448 kW) | Engine / motor | 2.0L 4-cyl |
| Single-speed | Transmission | CVT |
| AWD | 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 Ioniq 6 vs Kia K4 across model years
- Hyundai Ioniq 6
- 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 Ioniq 6 has more passenger space (103 vs. 99 cu ft); the Kia K4 has more cargo space (15 vs. 11 cu ft).
Among 12 2027 midsize cars, the Hyundai Ioniq 6 ranks 3rd and the Kia K4 5th for lowest fuel cost.
Because the Hyundai Ioniq 6 is fully electric, it has no tailpipe emissions and its running cost depends almost entirely on your electricity rate. Cheap overnight home charging widens its advantage over the Kia K4; relying on DC fast chargers can erase it.
Frequently asked questions
Which is more fuel-efficient, the 2027 Hyundai Ioniq 6 or the 2027 Kia K4?
Measured by cost to drive, the Hyundai Ioniq 6. The Hyundai Ioniq 6 is rated 88 MPGe combined and the Kia K4 33 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2027 Hyundai Ioniq 6 vs. the Kia K4 per year?
At 15,000 miles a year with 18¢/kWh electricity and $3.10/gal regular gas, about $1,023 for the Hyundai Ioniq 6 and $1,409 for the Kia K4.
Which has more cargo space?
The Kia K4, with 15 cu ft of luggage volume versus 11 cu ft (EPA interior volume index).
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