GMC Sierra 4WD (Flex Fuel) (2026) Specifications

The GMC Sierra 4WD (Flex Fuel) is powered by a turbocharged 2.7 L Gasoline or E85 engine, paired with a 10 speed automatic transmission. It returns a combined fuel economy of 17 MPG. Body style is a Pickup Truck with 4 doors.

Fuel Economy

City MPG15

Highway MPG19

Combined MPG17

Annual Fuel Cost$3950

GHG Score3 / 10

Engine & Drivetrain

Engine Size5.3 L

Cylinders8

Fuel TypeGasoline or E85

TransmissionAutomatic 10-spd

Drivetrain4-Wheel Drive

CO₂524 g/mi

Classification

Vehicle ClassStandard Pickup Trucks 4×4

TypeFFV

Body & Engine

Body TypePickup Truck

AspirationTurbo

Engine TypePetrol

Gearbox10 speed automatic

Engine LayoutLongitudinal

Additional Specs

Doors4

Engine ManufacturerGMC

Engine Capacity2.7 L

Max Power310 hp

Max Torque395 lb-ft

Fuel SystemDirect Injection

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