2018 GMC Sierra
The 2018 GMC Sierra is listed in 14 versions in the EPA fuel economy database, with 4.3 L 6-cyl, 5.3 L 8-cyl, 5.3 L 8-cyl hybrid and 6.2 L 8-cyl powertrains. Combined fuel economy ranges from 17 to 20 MPG (best: 11.8 L/100 km).
Model year2018
Versions14
ClassSpecial Purpose Vehicle 2WD, Special Purpose Vehicle 4WD, Standard Pickup Trucks 2WD, Standard Pickup Trucks 4WD
Drive4-Wheel Drive, Rear-Wheel Drive
Engines, transmissions & fuel economy
| Version | Powertrain | Transmission | Drive | Fuel | MPG city / hwy / comb | L/100 km (comb) | CO2 g/mi | Class |
|---|---|---|---|---|---|---|---|---|
| Sierra 15 Hybrid 2WD | 5.3 L 8-cyl hybrid | Automatic 8-spd | Rear-Wheel Drive | Regular | 18 / 24 / 20 | 11.8 | 447 | Standard Pickup Trucks 2WD |
| Sierra 15 Hybrid 4WD | 5.3 L 8-cyl hybrid | Automatic 8-spd | 4-Wheel Drive | Regular | 16 / 21 / 18 | 13.1 | 490 | Standard Pickup Trucks 4WD |
| Sierra C15 2WD | 4.3 L 6-cyl | Automatic 6-spd | Rear-Wheel Drive | Gasoline or E85 | 18 / 24 / 20 | 11.8 | 448 | Standard Pickup Trucks 2WD |
| Sierra C15 2WD | 5.3 L 8-cyl | Automatic 6-spd | Rear-Wheel Drive | Regular | 16 / 23 / 19 | 12.4 | 475 | Standard Pickup Trucks 2WD |
| Sierra C15 2WD | 5.3 L 8-cyl | Automatic 6-spd | Rear-Wheel Drive | Gasoline or E85 | 16 / 23 / 19 | 12.4 | 475 | Standard Pickup Trucks 2WD |
| Sierra C15 2WD | 5.3 L 8-cyl | Automatic 8-spd | Rear-Wheel Drive | Regular | 16 / 22 / 18 | 13.1 | 495 | Standard Pickup Trucks 2WD |
| Sierra C15 2WD | 6.2 L 8-cyl | Automatic 8-spd | Rear-Wheel Drive | Premium | 15 / 21 / 17 | 13.8 | 517 | Standard Pickup Trucks 2WD |
| Sierra C15 Cab Chassis 2WD | 5.3 L 8-cyl | Automatic 6-spd | Rear-Wheel Drive | Regular | 15 / 20 / 17 | 13.8 | 523 | Special Purpose Vehicle 2WD |
| Sierra K15 4WD | 4.3 L 6-cyl | Automatic 6-spd | 4-Wheel Drive | Gasoline or E85 | 17 / 22 / 19 | 12.4 | 474 | Standard Pickup Trucks 4WD |
| Sierra K15 4WD | 5.3 L 8-cyl | Automatic 6-spd | 4-Wheel Drive | Regular | 16 / 22 / 18 | 13.1 | 489 | Standard Pickup Trucks 4WD |
| Sierra K15 4WD | 5.3 L 8-cyl | Automatic 6-spd | 4-Wheel Drive | Gasoline or E85 | 16 / 22 / 18 | 13.1 | 489 | Standard Pickup Trucks 4WD |
| Sierra K15 4WD | 5.3 L 8-cyl | Automatic 8-spd | 4-Wheel Drive | Regular | 15 / 20 / 17 | 13.8 | 522 | Standard Pickup Trucks 4WD |
| Sierra K15 4WD | 6.2 L 8-cyl | Automatic 8-spd | 4-Wheel Drive | Premium | 15 / 20 / 17 | 13.8 | 524 | Standard Pickup Trucks 4WD |
| Sierra K15 Cab Chassis 4WD | 5.3 L 8-cyl | Automatic 6-spd | 4-Wheel Drive | Regular | 15 / 19 / 17 | 13.8 | 523 | Special Purpose Vehicle 4WD |
Figures are EPA estimates for the U.S. market (U.S. gallons). Your mileage will vary. Transmissions: (S6) = 6-speed with manual select mode, (AV) = continuously variable, (AM) = automated manual.
Safety recalls
Check the NHTSA recall database for the 2018 GMC Sierra.