2025 GMC Sierra

Truck Diesel
GMC Sierra 2025
26MPG Combined
13 Trims
← 2024 2025 2026 →
Updated February 27, 2026

Looking at the 2025 GMC Sierra? This Truck offers 16–26 combined MPG depending on trim and comes with 13 available configurations. We break down the specs, safety data, and how it compares to the competition.

2025 GMC Sierra Specifications

SpecValue
Combined MPG16–26 combined MPG depending on trim
City MPG23
Highway MPG29
Body StyleTruck
Fuel TypeDiesel
DriveRWD
Available Trims13

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto23/29/263.0L 6cylAutomatic 10-spd
Auto18/21/192.7L 4cylAutomatic 8-spd
Sport17/21/192.7L 4cylAutomatic 8-spd
Sport16/21/185.3L 8cylAutomatic 10-spd
Auto16/20/175.3L 8cylAutomatic 10-spd
Sport22/26/243.0L 6cylAutomatic 10-spd
Sport17/18/172.7L 4cylAutomatic 8-spd
Auto17/19/182.7L 4cylAutomatic 8-spd
Auto15/19/175.3L 8cylAutomatic 10-spd
Auto15/19/166.2L 8cylAutomatic 10-spd
Auto15/19/165.3L 8cylAutomatic 10-spd
Sport15/19/175.3L 8cylAutomatic 10-spd
Auto15/19/175.3L 8cylAutomatic 10-spd

Annual Fuel Cost

Based on EPA estimates, the 2025 GMC Sierra costs approximately $2,561 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

Compare the 2025 GMC Sierra

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