Photo: GMC Sierra by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons. It shows the model, not always this exact version.
GMC · model year 2018
2018 GMC Sierra K15 4WD
Pickup · 4-Wheel Drive · Gas · EPA class: Standard Pickup Trucks 4WD
EPA figures · 2018fueleconomy.gov
19MPG combined
17/22MPG city / highway
$3,550fuel a year
474 g CO₂ per mile 4.3 L 6-cyl Automatic 6-spd
This car on fueleconomy.gov, read 2 October 2026. Your own figures depend on how and where you drive.
Where it places
Every figure on record
- Combined MPG
- 19 MPG
- City MPG
- 17 MPG
- Highway MPG
- 22 MPG
- Annual fuel cost
- $3,550
- Tailpipe CO₂
- 474 g per mile
- Model year
- 2018
- Body
- Pickup
- EPA size class
- Standard Pickup Trucks 4WD
- Drive
- 4-Wheel Drive
- Engine
- 4.3 L 6-cyl
- Transmission
- Automatic 6-spd
- Fuel
- Gasoline
Efficiency
Running cost
The car
Powertrain
More GMC model years
2018 GMC Sierra C15 2WD
20 MPG · $3,350 fuel a year 2018 GMC Sierra C15 2WD
18 MPG · $3,700 fuel a year 2018 GMC Sierra C15 2WD
19 MPG · $3,550 fuel a year 2018 GMC Sierra C15 2WD
19 MPG · $3,550 fuel a year 2018 GMC Sierra C15 2WD
17 MPG · $4,850 fuel a year 2018 GMC Sierra C15 Cab Chassis 2WD
17 MPG · $3,950 fuel a year 2018 GMC Sierra K15 4WD
17 MPG · $4,850 fuel a year