GMC Sierra 4WD (Flex Fuel) Fuel Economy History
MPG by year — EPA official data.
Best MPG Year
2026
17 MPG combined
Latest Model
2026
17 MPG combined
| Year | Engine | City | Hwy | Combined | Fuel Cost/yr | |
|---|---|---|---|---|---|---|
| 2026 | Gasoline or E85 FFV | 15 | 19 | 17 | $3,950 | Details → |
MPG by year — EPA official data.
| Year | Engine | City | Hwy | Combined | Fuel Cost/yr | |
|---|---|---|---|---|---|---|
| 2026 | Gasoline or E85 FFV | 15 | 19 | 17 | $3,950 | Details → |