2023 GMC Sierra

Truck Flex Fuel
GMC Sierra 2023
26MPG Combined
15 Trims
← 2022 2023 2024 →
Updated February 27, 2026

Looking at the 2023 GMC Sierra? This Truck offers 17–26 combined MPG depending on trim and comes with 15 available configurations. We break down the specs, safety data, and how it compares to the competition.

2023 GMC Sierra Specifications

SpecValue
Combined MPG17–26 combined MPG depending on trim
City MPG24
Highway MPG29
Body StyleTruck
Fuel TypeFlex Fuel
DriveRWD
Available Trims15

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto16/20/185.3L 8cylAutomatic 10-spd
Sport16/21/185.3L 8cylAutomatic 10-spd
Auto24/29/263.0L 6cylAutomatic 10-spd
Auto16/20/185.3L 8cylAutomatic 10-spd
Auto16/21/185.3L 8cylAutomatic 10-spd
Auto19/22/202.7L 4cylAutomatic 8-spd
Sport19/21/202.7L 4cylAutomatic 8-spd
Auto15/19/175.3L 8cylAutomatic 10-spd
Auto22/27/243.0L 6cylAutomatic 10-spd
Sport18/20/192.7L 4cylAutomatic 8-spd
Sport16/20/175.3L 8cylAutomatic 10-spd
Auto16/20/175.3L 8cylAutomatic 10-spd
Auto15/19/175.3L 8cylAutomatic 10-spd
Auto15/19/176.2L 8cylAutomatic 10-spd
Auto18/20/192.7L 4cylAutomatic 8-spd

Annual Fuel Cost

Based on EPA estimates, the 2023 GMC Sierra costs approximately $2,470 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

Compare the 2023 GMC Sierra

See how it stacks up against similar vehicles:

Other Model Years

Check Vehicle History

Considering a used GMC Sierra? Get a comprehensive vehicle history report including accident records, ownership history, and more.

🔍 Check GMC Sierra Vehicle History Check VIN →
Check Vehicle History

Get the full story — accidents, ownership, recalls, odometer, and more. Decode any VIN instantly.

Check VIN
Buying a used GMC Sierra? Check VIN on RedVIN