| Engines | EPA Estimated Fuel Economy (city/hwy) |
Fuel Tank Capacity (gallons) |
|||
|---|---|---|---|---|---|
| Short Box |
Standard Box |
Long Box |
|||
| 2WD Models with 4-speed automatic transmission | Vortec 4.3L V6 | 15/20 | 26 | 26 | 34 |
| 4WD Models with 4-speed automatic transmission | Vortec 4.3L V6 | 14/18 | 26 | 26 | 34 |
| 2WD Models with 4-speed automatic transmission | Vortec 4.8L V8 | 14/19 | 26 | 26 | 34 |
| 4WD Models with 4-speed automatic transmission | Vortec 4.8L V8 | 14/18 | 26 | 26 | 34 |
| 2WD model with 4-speed automatic transmission | Vortec 5.3L Flex Fuel V8 Engine | 15/21 | 26 | 26 | 34 |
| 2WD model with 4-speed automatic transmission | XFE Model: Vortec 5.3L Flex Fuel V8 Engine | 15/21 | 26 | 26 | 34 |
| 2WD Models with 4-speed automatic transmission | Vortec 5.3L V8 with Active Fuel Management | 14/20 | 26 | 26 | 34 |
| 4WD Models with 4-speed automatic transmission | Vortec 5.3L V8 with Active Fuel Management | 14/19 | 26 | 26 | 34 |
| 2WD Models with 6-speed automatic transmission | Vortec 6.0L V8 | 14/19 | 26 | 26 | 34 |
| 4WD Models with 6-speed automatic transmission | Vortec 6.0L V8 | 13/18 | 26 | 26 | 34 |
| 4WD Models with 6-speed automatic transmission | Vortec 6.2L V8 | 12/19 | 26 | 26 | 34 |