GMC Terrain Denali/AT4 MPG by year — every rating on record
The GMC Terrain Denali/AT4 has a combined EPA fuel economy rating for 2 model years, from 2026 to 2027. Across those years its best rated version returned 25 mpg (2026) and its thirstiest returned 25 mpg (2026). The EPA record holds 2 configurations for this nameplate, most recently a Small Sport Utility Vehicle 4WD.
Year-by-year EPA ratings
| Model year | Configurations | Best combined | Worst combined | Class rank that year | Drivetrains | Fuel | EPA class |
|---|---|---|---|---|---|---|---|
| 2026 | 1 | 25 mpg | 25 mpg | #128 of 188 (32th pct) | All-Wheel Drive | Regular | Small Sport Utility Vehicle 4WD |
| 2027 | 1 | 25 mpg | 25 mpg | #39 of 49 (21th pct) | All-Wheel Drive | Regular | Small Sport Utility Vehicle 4WD |
Where it has stood in its class
Ranked against every other nameplate the EPA filed under the same class that year. The GMC Terrain Denali/AT4 placed highest in 2027 at #39 of 49, and lowest in 2026 at #128 of 188. It spent 0 of its 2 ranked years in the top half of its class.
Every configuration on record
All 2 configurations EPA lists for this nameplate, newest first.
| Year | Configuration | Engine detail | City | Highway | Combined | Gallons/yr | Barrels/yr | EPA fuel cost/yr | CO2 g/mi | GHG |
|---|---|---|---|---|---|---|---|---|---|---|
| 2027 | 1.5L 4-cyl All-Wheel Drive Automatic 8-spd Regular | SIDI, turbocharged, start-stop | 24 | 26 | 25 | 460.0 | 11.9 | $2,500 | 359 | 5/10 |
| 2026 | 1.5L 4-cyl All-Wheel Drive Automatic 8-spd Regular | SIDI, turbocharged, start-stop | 24 | 26 | 25 | 460.0 | 11.9 | $2,500 | 358 | 5/10 |
What Terrain Denali/AT4 fuel costs over a year
At the EPA's 11,500 miles a year, the 2027 GMC Terrain Denali/AT4 burns 460 to 460 gallons depending on configuration. Below is what that costs at three pump prices, and how much more the thirstiest configuration costs than the most efficient one.
| Pump price | Most efficient | Thirstiest | Spread |
|---|---|---|---|
| $3.00/gal | $1,380 | $1,380 | $0 |
| $3.50/gal | $1,610 | $1,610 | $0 |
| $4.00/gal | $1,840 | $1,840 | $0 |
EPA’s own estimate for the 2027 model year is $2,500 to $2,500 a year in fuel, or $1,250 more than the average new vehicle over five years.
How it compares with other Small Sport Utility Vehicle 4WD
Across the 311 nameplates EPA classifies as Small Sport Utility Vehicle 4WD, the median best combined rating is 27 mpg. At 25 mpg the GMC Terrain Denali/AT4 is 2 mpg below the median, which is worth about $119 a year at $3.50 a gallon.
- All Small Sport Utility Vehicle 4WD rankings — every nameplate in the class, best to worst.
Other GMC nameplates
Every GMC model compared → — all nameplates ranked by best combined rating, with what each one costs a year.