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OverviewSpecifications
GMC Sierra 4WD AT4X

GMC Sierra 4WD AT4X (2026) Specifications

The GMC Sierra 4WD AT4X is powered by a 6.2L Diesel engine, paired with a 10 speed automatic transmission. It returns a combined fuel economy of 19 MPG. Body style is a Pickup Truck with 4 doors.

Fuel Economy
City MPG19
Highway MPG20
Combined MPG19
Annual Fuel Cost$4450
GHG Score3 / 10
Engine & Drivetrain
Engine Size3 L
Cylinders6
Fuel TypeDiesel
TransmissionAutomatic 10-spd
Drivetrain4-Wheel Drive
CO₂524 g/mi
Classification
TypeDiesel
Body & Engine
Body TypePickup Truck
AspirationTurbocharged
Engine TypePetrol
Engine LayoutLongitudinal
Additional Specs
Doors4
Engine ManufacturerGeneral Motors
Engine Capacity6.2L
Wheel Size20 inch
BrakesFour-wheel disc with ABS
Fuel SystemDirect Injection
Dimensions & Weight
Ground Clearance10.7 inches
Fuel Tank Capacity24.0 gallons
Performance & Chassis
Front TyresLT265/70R18
Rear TyresLT265/70R18
GMC Sierra 4WD AT4X Across Model Years
GMC Sierra 4WD AT4X2023GMC Sierra 4WD AT4X2024GMC Sierra 4WD AT4X2025GMC Sierra 4WD AT4X2026
Price$83,995$85,900$87,000—
Engine Capacity6.2L2.7L6.2L6.2L
Fuel TypePremiumRegularPremiumDiesel
TransmissionAutomatic 10-spdAutomatic 8-spdAutomatic 10-spd10 speed automatic
Body TypeStandard Pickup Trucks 4WDStandard Pickup Trucks 4WDStandard Pickup Trucks 4WDPickup Truck
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