Vehicle comparison
Hyundai Sonata vs Kia K5
Side-by-side fuel and ownership cost comparison. Estimates use 12,000 mi/year at average US gas prices.
- Updated for 2026
- EPA-style MPG
- US avg fuel prices
- US units
- Transparent assumptions
Lowest running cost
Hyundai Sonata wins on fuel cost
At 12,000 miles per year, the Hyundai Sonata costs about $1294 per year, roughly $42 less than the Kia K5. Over 5 years, that's about $209 in fuel savings.
Spec & cost comparison
MPG/MPGe figures are estimates based on typical recent model years.
| Spec | Hyundai Sonata | Kia K5 |
|---|---|---|
| Type | SEDAN | SEDAN |
| Fuel | Regular gas | Regular gas |
| City MPG/MPGe | 28 | 27 |
| Highway MPG/MPGe | 38 | 37 |
| Combined MPG/MPGe | 32 | 31 |
| Tank / Battery | 16 gal | 15.8 gal |
| Energy cost | $3.45/gal | $3.45/gal |
| Cost per mile | $0.108 | $0.111 |
Annual cost at 8k / 12k / 15k miles
Estimated yearly fuel spend at common US mileage levels.
| Miles/year | Hyundai Sonata | Kia K5 | Difference |
|---|---|---|---|
| 8,000 | $863/yr · $72/mo | $890/yr · $74/mo | $28 (Hyundai Sonata) |
| 12,000 | $1294/yr · $108/mo | $1335/yr · $111/mo | $42 (Hyundai Sonata) |
| 15,000 | $1617/yr · $135/mo | $1669/yr · $139/mo | $52 (Hyundai Sonata) |
Estimates only. Real costs depend on driving style, terrain, local gas/electricity prices and weather.
Which one is best for…
Best for commuting
Hyundai Sonata
Highest combined MPG/MPGe and lowest cost per mile means cheaper daily driving.
See Hyundai SonataBest for road trips
Hyundai Sonata
Better highway efficiency, larger tank/battery and longer range between stops.
See Hyundai SonataBest for families
Hyundai Sonata
SUVs, minivans and three-row vehicles win on space and child-seat flexibility.
See Hyundai SonataBest for lowest running cost
Hyundai Sonata
Cheaper energy use and lower cost per mile at every common mileage tier.
See Hyundai SonataHow we compare these vehicles
- Annual mileage
- Modeled at 12,000 mi/yr unless a scenario specifies otherwise.
- Cost per mile
- $/gal ÷ MPG, or $/kWh ÷ (MPGe ÷ 33.7) for EVs.
- EV vs gas
- Compared at average US gas and residential electricity prices — fast-charging can be 2–3× higher.
- Maintenance
- Fuel cost only — EVs typically save another $400–$1,000/yr in service and brake wear.
Sources & assumptions
- EPA fuel economy data — City / highway / combined MPG and MPGe baselines.
- U.S. Department of Energy (fueleconomy.gov) — Vehicle efficiency and EV range references.
- AAA gas price trends — Recent national and regional retail fuel averages.
- EIA electricity rates — Average residential per-kWh prices used for EV charging.
We summarize publicly available data — no scraping, no external API calls. Figures are calibrated periodically; use the calculators above for your exact inputs.
Frequently asked questions
Which is cheaper to drive, the Hyundai Sonata or Kia K5?
At 12,000 miles per year, the Hyundai Sonata costs about $1294 per year vs $1335 for the Kia K5 — roughly $42 less per year.
What's the MPG difference between the Hyundai Sonata and Kia K5?
The Hyundai Sonata is rated around 32 combined MPG versus 31 MPG for the Kia K5. Highway figures are 38 vs 37.
How much will I spend on fuel over 5 years?
Driving 12,000 miles a year for five years, expect about $6469 for the Hyundai Sonata and $6677 for the Kia K5, a difference of roughly $209.
Is the Hyundai Sonata or Kia K5 better for commuting?
For pure cost per mile, the Hyundai Sonata wins. EVs charged at home typically deliver the lowest commuting cost, followed by hybrids and efficient compacts.
Which one is better for road trips?
Hyundai Sonata is generally the better road-trip choice — gas and hybrid vehicles win on long highway routes thanks to faster refueling, while EVs work best when charging stops fit your route.
Are these fuel cost numbers accurate for my driving?
They're estimates based on EPA-style combined MPG and average US gas prices. Real-world cost depends on local fuel prices, driving style, terrain, weather and how much city vs highway driving you do.