2018 GMC Terrain Specs
6 powertrain configurations on federal record for the 2018 GMC Terrain: 2.0L 4-cyl Premium Gasoline; 1.5L 4-cyl Regular Gasoline; 1.6L 4-cyl Diesel, in Front-Wheel Drive and All-Wheel Drive, rated up to 32 MPG combined by the EPA.
Source: EPA federal records (fueleconomy.gov) · Updated 2026-10-26 · By CarWhere Research
| Engine | Transmission | Drivetrain | City | Highway | Combined |
|---|---|---|---|---|---|
| 2.0L 4-cyl Premium Gasoline | Automatic 9-spd | Front-Wheel Drive | 22 | 28 | 24 |
| 2.0L 4-cyl Premium Gasoline | Automatic 9-spd | All-Wheel Drive | 21 | 26 | 23 |
| 1.5L 4-cyl Regular Gasoline | Automatic 9-spd | All-Wheel Drive | 24 | 28 | 26 |
| 1.5L 4-cyl Regular Gasoline | Automatic 9-spd | Front-Wheel Drive | 26 | 30 | 28 |
| 1.6L 4-cyl Diesel | Automatic 6-spd | Front-Wheel Drive | 28 | 39 | 32 |
| 1.6L 4-cyl Diesel | Automatic 6-spd | All-Wheel Drive | 28 | 38 | 32 |
Terrain by year
Buying a used Terrain? Specs are the easy half.
Check which Terrain years to avoid (federal complaint and recall records), see the live Terrain value by year, then check the specific car: the Full VIN Report shows that VIN's factory build, recall record, and market history before you pay for it.
Frequently asked questions
What engines does the 2018 GMC Terrain have?
3 engines on federal record: 2.0L 4-cyl Premium Gasoline; 1.5L 4-cyl Regular Gasoline; 1.6L 4-cyl Diesel, offered with Automatic 9-spd, Automatic 6-spd and Front-Wheel Drive or All-Wheel Drive. The full per-configuration table is above.
What gas mileage does the 2018 GMC Terrain get?
EPA combined ratings run 23–32 MPG depending on configuration — the table above shows city/highway/combined for each engine, transmission, and drivetrain.
Is 2018 a good year for the GMC Terrain?
Specs don't answer that — the federal complaint and recall record does. See the GMC Terrain year-by-year reliability verdicts at carwhere.com/research/years-to-avoid/gmc/terrain, built from NHTSA data.
How do I get the specs for my exact VIN?
These are the federal-record configurations for the 2018 GMC Terrain overall. For one specific vehicle — its exact engine, trim, factory options, and original window sticker — decode the 17-character VIN free at carwhere.com/tools/vin-decoder.
Where does this data come from?
The U.S. EPA's public vehicle dataset (fueleconomy.gov) — the federal record of every US-market configuration since 1984 — refreshed 2026-10-26. Public-domain data; republish with attribution to CarWhere (carwhere.com).