The 2018 Kia Optima delivers an EPA-certified 25–42 MPG combined across 7 configurations. Hybrid variants achieve up to 42 MPG combined, compared to 31 MPG for standard gasoline trims. Estimated annual fuel costs range from $1,450 to $2,450.
Factual efficiency differences across gasoline, hybrid, plug-in hybrid, and electric variants
Annual Fuel Cost: $2,000–$2,450.
Annual Fuel Cost: $1,450–$1,450 (saves vs gas).
Gasoline Combined: 40 MPG • Annual Cost: $1,550.
Laboratory certification test values across engine, transmission, and drivetrain permutations
| Configuration / Model | Powertrain | Drivetrain | Transmission | City | Highway | Combined | EV Range | Annual Fuel Cost | CO2 (g/mi) |
|---|---|---|---|---|---|---|---|---|---|
| Optima Regular | 1.6L 4-Cyl Gas | Front-Wheel Drive | Automatic (AM7) | 28 MPG | 37 MPG | 31 MPG | — | $2,000 | — |
| Optima FE Regular | 2.4L 4-Cyl Gas | Front-Wheel Drive | Automatic (S6) | 25 MPG | 36 MPG | 29 MPG | — | $2,100 | — |
| Optima Regular | 2.4L 4-Cyl Gas | Front-Wheel Drive | Automatic (S6) | 24 MPG | 34 MPG | 28 MPG | — | $2,200 | — |
| Optima S Regular | 2.4L 4-Cyl Gas | Front-Wheel Drive | Automatic (S6) | 23 MPG | 32 MPG | 26 MPG | — | $2,350 | — |
| Optima Regular | 2L 4-Cyl Gas | Front-Wheel Drive | Automatic (S6) | 22 MPG | 31 MPG | 25 MPG | — | $2,450 | — |
| Optima Hybrid Regular | 2L Hybrid | Front-Wheel Drive | Automatic (AM6) | 39 MPG | 46 MPG | 42 MPG | — | $1,450 | — |
| Optima Plug-in Hybrid Regular Gas and Electricity | 2L Plug-in Hybrid | Front-Wheel Drive | Automatic (AM6) | 103 MPGe (38 MPG) | 104 MPGe (43 MPG) | 103 MPGe (40 MPG) | 29 mi | $1,550 | — |
Standardized annual energy consumption and operating cost metrics based on 15,000 annual miles
Based on $3.50 per gallon regular gasoline
Estimated annual energy units needed for 15,000 miles
Compared to the average new vehicle over 5 years
Cross-reference safety ratings, owner defect complaints, and recall campaigns
Vehicle summary, specifications, and primary KPI metrics.
NHTSA 5-Star NCAP crash tests, rollover risk, and active driver assistance.
NHTSA consumer defect complaint filings by affected component.
Official safety recall notices, defects, and free repair instructions.
Direct, deterministic answers synthesized from verified United States government databases for the 2018 Kia Optima
The 2018 Kia Optima achieves an EPA-certified rating of 25 to 42 MPG combined across 7 certified configuration(s).
City ratings range from 22 to 42 MPG, and highway ratings range from 25 to 46 MPG.
Hybrid (HEV) models achieve up to 42 MPG combined, delivering approximately 11 more miles per gallon than standard gasoline configurations (up to 31 MPG combined).
Gas-electric hybrid variants use regenerative braking and electric assist motors to reduce fuel consumption in stop-and-go city driving.
Using AutoUtility's standardized operating cost model, estimated annual fueling and energy costs range between $1,450 and $2,450 for the 2018 Kia Optima.
Calculated under AutoUtility's standardized methodology (15,000 miles per year, 55% city / 45% highway driving, $3.50/gallon regular gasoline, $0.16/kWh electricity) using official EPA dynamometer consumption ratings.
Fuel economy ratings, electric range figures, and energy cost estimates on this page are retrieved directly from the United States Environmental Protection Agency (EPA) and U.S. Department of Energy (FuelEconomy.gov) certified vehicle database under 40 CFR Part 600.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.