GMC Sierra Mud Terrain Tires 4WD (Sport Mode) Fuel Economy History
MPG by year — EPA official data.
Best MPG Year
2026
16 MPG combined
Latest Model
2026
16 MPG combined
| Year | Engine | City | Hwy | Combined | Fuel Cost/yr | |
|---|---|---|---|---|---|---|
| 2026 | Regular | 15 | 18 | 16 | $4,200 | Details → |