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 Mud Terrain Tires with Sport Mode
Pickup · 4-Wheel Drive · Diesel · EPA class: Standard Pickup Trucks 4WD
EPA figures · 2026fueleconomy.gov
23MPG combined
21/24MPG city / highway
$4,150fuel a year
451 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
- 27 Diesel cars and trucks by MPG
Ordered by combined MPG #27 of 44 - 431 2026 cars and trucks
Every car of that year, A to Z #431 of 1,172 - 594 Fuel-efficient AWD and 4WD cars
Ordered by combined MPG #594 of 1,362 - 1658 Gas and hybrid cars by fuel cost
Ordered by fuel a year #1658 of 2,158 - 49 GMC cars
Every model year, newest first #49 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
- 23 MPG
- City MPG
- 21 MPG
- Highway MPG
- 24 MPG
- Annual fuel cost
- $4,150
- Tailpipe CO₂
- 451 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
Cars around it
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23 MPG · $4,150 fuel a year 2025 GMC Sierra Mud Terrain Tires 4WD
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23 MPG · $4,150 fuel a year
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