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 2026
2026 GMC Sierra 4WD AT4X with Sport Mode
Pickup · 4-Wheel Drive · Diesel · EPA class: Standard Pickup Trucks 4WD
EPA figures · 2026fueleconomy.gov
19MPG combined
19/20MPG city / highway
$5,050fuel a year
524 g CO₂ per mile 3.0 L 6-cyl turbo Automatic 10-spd
This car on fueleconomy.gov, read 2 October 2026. Your own figures depend on how and where you drive.
Where it places
- 44 Diesel cars and trucks by MPG
Ordered by combined MPG #44 of 44 - 416 2026 cars and trucks
Every car of that year, A to Z #416 of 1,172 - 1013 Fuel-efficient AWD and 4WD cars
Ordered by combined MPG #1013 of 1,362 - 1979 Gas and hybrid cars by fuel cost
Ordered by fuel a year #1979 of 2,158 - 34 GMC cars
Every model year, newest first #34 of 2,900
Against diesel cars and trucks by MPG
Chart average 23 MPGBest 26 MPG
Lowest on the chart $3,700Chart average $4,210
Every figure on record
- Combined MPG
- 19 MPG
- City MPG
- 19 MPG
- Highway MPG
- 20 MPG
- Annual fuel cost
- $5,050
- Tailpipe CO₂
- 524 g per mile
- Model year
- 2026
- Body
- Pickup
- EPA size class
- Standard Pickup Trucks 4WD
- Drive
- 4-Wheel Drive
- Engine
- 3.0 L 6-cyl turbo
- Transmission
- Automatic 10-spd
- Fuel
- Diesel
Efficiency
Running cost
The car
Powertrain
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