2021 GMC Terrain Specs
2 powertrain configurations on federal record for the 2021 GMC Terrain: 1.5L 4-cyl Regular Gasoline, in Front-Wheel Drive and All-Wheel Drive, rated up to 27 MPG combined by the EPA.
Source: EPA federal records (fueleconomy.gov) · Updated 2026-10-26 · By CarWhere Research
| Engine | Transmission | Drivetrain | City | Highway | Combined |
|---|---|---|---|---|---|
| 1.5L 4-cyl Regular Gasoline | Automatic 9-spd | Front-Wheel Drive | 25 | 30 | 27 |
| 1.5L 4-cyl Regular Gasoline | Automatic 9-spd | All-Wheel Drive | 25 | 28 | 26 |
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 2021 GMC Terrain have?
One powertrain on federal record: 1.5L 4-cyl Regular Gasoline, offered with Automatic 9-spd and Front-Wheel Drive or All-Wheel Drive. The full per-configuration table is above.
What gas mileage does the 2021 GMC Terrain get?
EPA combined ratings run 26–27 MPG depending on configuration — the table above shows city/highway/combined for each engine, transmission, and drivetrain.
Is 2021 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 2021 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).