1991 GMC Sierra: Sierra 2500 4WD · 6.2L · AWD · 5-speed manual · Diesel
One configuration of the 1991 GMC Sierra as listed by our sources. Every figure below carries its source.
| Specification | Value | Source |
|---|---|---|
| Engine | 6.2L 8-cylinder ((DIESEL) (NO-CAT)) | EPA fueleconomy.gov |
| Displacement | 6.2 L | EPA fueleconomy.gov |
| Cylinders | 8 | EPA fueleconomy.gov |
| Fuel type | Diesel | EPA fueleconomy.gov |
| Transmission | 5-speed manual | EPA fueleconomy.gov |
| Drivetrain | AWD | EPA fueleconomy.gov |
| Combined economy | 18 mpg (13.1 L/100 km) | EPA fueleconomy.gov |
| City economy | 17 mpg (13.8 L/100 km) | EPA fueleconomy.gov |
| Highway economy | 21 mpg (11.2 L/100 km) | EPA fueleconomy.gov |
Provenance & verification
- EPA fueleconomy.gov · US Government public data
Source checked: October 21, 2026
Data verified: October 21, 2026