| Engines | EPA Estimated Fuel Economy (city/hwy) |
Fuel Tank Capacity (gallons) |
|
|---|---|---|---|
| 2WD Models | Vortec 5.3L V8 SFI with Active Fuel Management | 14/20 | 31 |
| 4WD Models | Vortec 5.3L V8 SFI FlexFuel with Active Fuel Management | Gasoline: 14/19 E85: 11/15 |
31 |
| 2WD Models | Vortec 6.0L VVT V8 SFI | 12/17 | 31/39 |
| 4WD Models | Vortec 6.0L VVT V8 SFI | 12/17 | 31/39 |