The 2018 Hyundai Ioniq delivers an EPA-certified 55–58 MPG combined across 4 configurations. Estimated annual fuel costs range from $550 to $1,200.
Factual efficiency differences across gasoline, hybrid, plug-in hybrid, and electric variants
Annual Fuel Cost: $1,050–$1,100 (saves vs gas).
Gasoline Combined: 52 MPG • Annual Cost: $1,200.
Annual Energy Cost: $550–$1,200.
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) |
|---|---|---|---|---|---|---|---|---|---|
| Ioniq Electric Electricity | Electric (BEV) | Front-Wheel Drive | Automatic (A1) | 150 MPGe | 122 MPGe | 136 MPGe | 124 mi | $550 | — |
| Ioniq Blue Regular | 1.6L Hybrid | Front-Wheel Drive | Automatic (AM6) | 57 MPG | 59 MPG | 58 MPG | — | $1,050 | — |
| Ioniq Regular | 1.6L Hybrid | Front-Wheel Drive | Automatic (AM6) | 55 MPG | 54 MPG | 55 MPG | — | $1,100 | — |
| Ioniq Plug-in Hybrid Regular Gas and Electricity | 1.6L Plug-in Hybrid | Front-Wheel Drive | Automatic (AM6) | 123 MPGe (53 MPG) | 114 MPGe (52 MPG) | 119 MPGe (52 MPG) | 29 mi | $1,200 | — |
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 Hyundai Ioniq
The 2018 Hyundai Ioniq achieves an EPA-certified rating of 55 to 58 MPG combined across 4 certified configuration(s).
City ratings range from 55 to 58 MPG, and highway ratings range from 54 to 59 MPG.
The 2018 Hyundai Ioniq plug-in hybrid (PHEV) delivers up to 29 miles of all-electric driving range before transitioning to hybrid gasoline operation.
In electric mode, efficiency is rated at 52 MPGe, switching to 0 MPG combined on gasoline.
Using AutoUtility's standardized operating cost model, estimated annual fueling and energy costs range between $550 and $1,200 for the 2018 Hyundai Ioniq.
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.