2018 GMC Terrain FWDFuel Economy & MPG Ratings
Photo: Jim Hudson Buick/Pontiac/GMC/Saab, http://www.jimhudsonsuperstore.com/. CC BY 3.0. via Wikimedia Commons
Real-World MPG
Based on 2 owner reports via EPA fueleconomy.gov
Range: 39–40 MPG
Driving mix: City 37% / Highway 63%
Source: EPA fueleconomy.gov “Your MPG” owner submissions. Real-world results vary by driver behavior, conditions, and equipment.
Owner reported MPG for this vehicle averages 39.4 real world MPG based on 2 owner reports. EPA combined rating is 32 MPG.
Trim Comparison
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 6-spd | Diesel Diesel | 28 | 39 | 32 | $2,650 |
| Automatic 9-spd | Regular | 26 | 30 | 28 | $2,400 |
| Automatic 9-spd | Premium | 22 | 28 | 24 | $3,400 |
Based on gasoline at $3.67/gal, 15,000 miles/year
vs. average new vehicle
Environment
- CO₂ Tailpipe Emissions
- 319 g/mile
- Annual Petroleum Consumption
- 11.2 barrels
Specifications
- Engine
- 2L 4-cyl
- Transmission
- 9-speed Automatic
- Drivetrain
- FWD
- Body Style
- SUV/Crossover
- GVWR
- Class 1 (≤6,000 lbs)
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 1.6L, 4-cylinder
- Efficiency Tech
- Auto Start-Stop
- Fuel Type
- Diesel
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $2,105/yr | — |
| California | $5.957/gal | $2,792/yrHIGHEST | +$687 |
| Texas | $3.888/gal | $1,823/yrLOWEST | $-282 |
| Florida | $4.136/gal | $1,939/yr | $-166 |
| New York | $4.522/gal | $2,120/yr | +$15 |
| Ohio | $4.510/gal | $2,114/yr | +$9 |
| Washington | $5.591/gal | $2,621/yr | +$516 |
| Colorado | $4.618/gal | $2,165/yr | +$60 |
| Minnesota | $4.344/gal | $2,036/yr | $-69 |
| Massachusetts | $4.448/gal | $2,085/yr | $-20 |
Calculated at 15,000 miles/year (EPA standard assumption) using 32 MPG combined. Regular gasoline prices. Actual costs vary.