2012 GMC Sierra: Sierra C15 2WD · 4.8L · RWD · 4-speed automatic · FFV
One configuration of the 2012 GMC Sierra as listed by our sources. Every figure below carries its source.
| Specification | Value | Source |
|---|---|---|
| Engine | 4.8L 8-cylinder (FFV) | EPA fueleconomy.gov |
| Displacement | 4.8 L | EPA fueleconomy.gov |
| Cylinders | 8 | EPA fueleconomy.gov |
| Fuel type | Flex fuel | EPA fueleconomy.gov |
| Transmission | 4-speed automatic | EPA fueleconomy.gov |
| Drivetrain | RWD | EPA fueleconomy.gov |
| Combined economy | 16 mpg (14.7 L/100 km) | EPA fueleconomy.gov |
| City economy | 14 mpg (16.8 L/100 km) | EPA fueleconomy.gov |
| Highway economy | 19 mpg (12.4 L/100 km) | EPA fueleconomy.gov |
Provenance & verification
- EPA fueleconomy.gov · US Government public data
Source checked: October 14, 2026
Data verified: October 14, 2026