2020 GMC Sierra

Truck Regular
GMC Sierra 2020
26MPG Combined
17 Trims
2020 2021 →
Updated February 27, 2026

Get the full picture on the 2020 GMC Sierra. As a Truck, it achieves 16–26 combined MPG depending on trim and has not yet been rated by NHTSA. Below you’ll find detailed specs for every trim, plus recall information and competitor comparisons.

2020 GMC Sierra Specifications

SpecValue
Combined MPG16–26 combined MPG depending on trim
City MPG23
Highway MPG30
Body StyleTruck
Fuel TypeRegular
DriveRWD
Available Trims17

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto16/21/174.3L 6cylAutomatic 6-spd
Auto17/23/195.3L 8cylAutomatic 8-spd
Auto19/22/202.7L 4cylAutomatic 8-spd
Auto23/30/263.0L 6cylAutomatic 10-spd
Auto15/21/175.3L 8cylAutomatic 6-spd
Auto15/19/165.3L 8cylAutomatic 6-spd
Sport20/23/212.7L 4cylAutomatic 8-spd
Auto17/24/205.3L 8cylAutomatic 8-spd
Auto16/22/185.3L 8cylAutomatic 8-spd
Auto16/22/195.3L 8cylAutomatic 10-spd
Sport19/22/202.7L 4cylAutomatic 8-spd
Auto15/20/176.2L 8cylAutomatic 10-spd
Auto15/20/175.3L 8cylAutomatic 6-spd
Auto22/26/243.0L 6cylAutomatic 10-spd
Auto19/22/202.7L 4cylAutomatic 8-spd
Auto15/20/174.3L 6cylAutomatic 6-spd
Auto14/19/165.3L 8cylAutomatic 6-spd

Annual Fuel Cost

Based on EPA estimates, the 2020 GMC Sierra costs approximately $2,452 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

Compare the 2020 GMC Sierra

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Other Model Years

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