2015 head-to-head · Midsize Car
2015 Buick Regal vs Kia Optima
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 2015 Kia Optima is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas, it costs about $1,788 a year to fuel (26 MPG), versus $1,938 for the 2015 Buick Regal (24 MPG). That's roughly $149 a year, or about $745 over five years.
Your numbers
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Fuel cost over 10 years
- Buick Regal
- Kia Optima
Side by side
| Buick Regal | Kia Optima | |
|---|---|---|
| $1,938 | Your annual fuel cost | $1,788 |
| 24 MPG | Combined efficiency | 26 MPG |
| 20 MPG | City | 23 MPG |
| 31 MPG | Highway | 33 MPG |
| 98 cu ft | Passenger volume | 102 cu ft |
| 13 cu ft | Cargo volume | 15 cu ft |
| 372 g/mi | Tailpipe CO₂ (g/mi) | 334 g/mi |
| 6/10 | EPA fuel economy score | 7/10 |
| 6/10 | EPA greenhouse gas score | 7/10 |
| Gas | Powertrain | Gas |
| Regular gasoline | Fuel | Regular gasoline |
| 2.0L 4-cyl turbo | Engine / motor | 2.4L 4-cyl |
| 6-speed manual | Transmission | 6-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.
Buick Regal vs Kia Optima across model years
- Buick Regal
- Kia Optima
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 Optima has more passenger space (102 vs. 98 cu ft); the Kia Optima has more cargo space (15 vs. 13 cu ft).
Among 69 2015 midsize cars, the Buick Regal ranks 40th and the Kia Optima 33rd for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2015 Buick Regal or the 2015 Kia Optima?
Measured by cost to drive, the Kia Optima. The Buick Regal is rated 24 MPG combined and the Kia Optima 26 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Buick Regal vs. the Kia Optima per year?
At 15,000 miles a year with $3.10/gal regular gas, about $1,938 for the Buick Regal and $1,788 for the Kia Optima.
Which has more cargo space?
The Kia Optima, with 15 cu ft of luggage volume versus 13 cu ft (EPA interior volume index).
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