2021 head-to-head · Large Car
2021 Hyundai Ioniq 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 2021 Hyundai Ioniq is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas, it costs about $788 a year to fuel (59 MPG), versus $1,453 for the 2021 Kia K5 (32 MPG). That's roughly $665 a year, or about $3,325 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
- Kia K5
Side by side
| Hyundai Ioniq | Kia K5 | |
|---|---|---|
| $788 | Your annual fuel cost | $1,453 |
| 59 MPG | Combined efficiency | 32 MPG |
| 58 MPG | City | 29 MPG |
| 60 MPG | Highway | 38 MPG |
| 96 cu ft | Passenger volume | 105 cu ft |
| 27 cu ft | Cargo volume | 16 cu ft |
| 151 g/mi | Tailpipe CO₂ (g/mi) | 277 g/mi |
| 10/10 | EPA fuel economy score | 7/10 |
| 10/10 | EPA greenhouse gas score | 7/10 |
| Hybrid | Powertrain | Gas |
| Regular gasoline | Fuel | Regular gasoline |
| 1.6L 4-cyl | Engine / motor | 1.6L 4-cyl turbo |
| 6-speed dual-clutch | 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 Ioniq vs Kia K5 across model years
- Hyundai Ioniq
- 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
Per EPA interior volume figures, the Kia K5 has more passenger space (105 vs. 96 cu ft); the Hyundai Ioniq has more cargo space (27 vs. 16 cu ft).
Among 27 2021 large cars, the Hyundai Ioniq ranks 2nd and the Kia K5 9th for lowest fuel cost.
The powertrains differ: the Hyundai Ioniq is a full hybrid, while the Kia K5 is a conventional gas model.
Frequently asked questions
Which is more fuel-efficient, the 2021 Hyundai Ioniq or the 2021 Kia K5?
Measured by cost to drive, the Hyundai Ioniq. The Hyundai Ioniq is rated 59 MPG combined and the Kia K5 32 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2021 Hyundai Ioniq vs. the Kia K5 per year?
At 15,000 miles a year with $3.10/gal regular gas, about $788 for the Hyundai Ioniq and $1,453 for the Kia K5.
Which has more cargo space?
The Hyundai Ioniq, with 27 cu ft of luggage volume versus 16 cu ft (EPA interior volume index).
Hyundai Ioniq vs Kia K5 in other years
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