Based on data from 33 vehicles, 338 fuel-ups and 132,987 miles of driving, the 2025 GMC Sierra 1500 gets a combined Avg MPG of 22.27 with a 0.63 MPG margin of error.

Any Engine Type DIESEL (2) L3 DIESEL (1) L6 DIESEL (9) V6 DIESEL (1) V8 GAS (3) Any Body Style Standard Cab Pickup (2) Crew Cab Pickup (12) Cab & Chassis - Crew Cab (1) Any Submodel SLT (4) AT4X (5) Denali Ultimate (8) Other (16)

Below you can see a distribution of the fuel-ups with 0 outliers (0.00%) removed.

Following shows the average MPG of each of the 33 vehicles in the system.

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• Odin

  2025 GMC Sierra 1500 AT4 L6 DIESEL Automatic 10 Speed
  Added Mar 2025 • 5 Fuel-ups

  Property of rjfelix

• 23.2 Avg MPG

• Sierra

  2025 GMC Sierra 1500 Elevation L6 DIESEL
  Added Mar 2025 • 6 Fuel-ups

  Property of awstott

• 23.4 Avg MPG

• 25 AT4

  2025 GMC Sierra 1500 AT4
  Added Apr 2025 • 14 Fuel-ups

  Property of sander025

• 23.3 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 Denali V6 DIESEL Automatic 10 Speed
  Added Apr 2025 • 12 Fuel-ups

  Property of Firedawg

• 25.8 Avg MPG

• 2025 Sierra 1500 SLT

  2025 GMC Sierra 1500 SLT DIESEL Automatic 10 Speed
  Added Mar 2025 • 21 Fuel-ups

  Property of svitale1

• 21.7 Avg MPG

• Sierra 1500 Duramax

  2025 GMC Sierra 1500 SLT
  Added Apr 2025 • 16 Fuel-ups

  Property of Mavis500

• 24.6 Avg MPG

• Ultimate

  2025 GMC Sierra 1500 Denali Ultimate V8 GAS Automatic 10 Speed Standard Cab Pickup
  Added Mar 2025 • 12 Fuel-ups

  Property of wjschettino

• 15.7 Avg MPG

• 2025 1500

  2025 GMC Sierra 1500 Elevation DIESEL
  Added Mar 2025 • 15 Fuel-ups

  Property of edwin191

• 25.7 Avg MPG

• AT4

  2025 GMC Sierra 1500 AT4
  Added Jan 2025 • 9 Fuel-ups

  Property of mja2770

• 23.5 Avg MPG

• ‘25 GMC AT4X

  2025 GMC Sierra 1500 AT4X
  Added Jan 2025 • 13 Fuel-ups

  Property of XtraTQ

• 19.5 Avg MPG

• Batmobile

  2025 GMC Sierra 1500 Denali Ultimate L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2025 • 3 Fuel-ups

  Property of MrLouers

• 26.7 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 SLT
  Added Mar 2025 • 13 Fuel-ups

  Property of Sanders417

• 19.2 Avg MPG

• Truck

  2025 GMC Sierra 1500 AT4 L6 DIESEL
  Added Mar 2025 • 9 Fuel-ups

  Property of stv718

• 23.2 Avg MPG

• 2025 Sierra Denali Ultimate

  2025 GMC Sierra 1500 Denali Ultimate V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2025 • 5 Fuel-ups

  Property of b1gted

• 12.8 Avg MPG

• 2025 Denali Ultimate

  2025 GMC Sierra 1500 Denali Ultimate
  Added Jan 2025 • 6 Fuel-ups

  Property of reece650

• 14.5 Avg MPG

• Blurple

  2025 GMC Sierra 1500 AT4 L6 DIESEL Automatic 10 Speed
  Added Jan 2025 • 10 Fuel-ups

  Property of cablebandit

• 25.9 Avg MPG

• Gray Ghost

  2025 GMC Sierra 1500 Denali Ultimate L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 25 Fuel-ups

  Property of Neurobit

• 27.6 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 AT4X
  Added Feb 2025 • 19 Fuel-ups

  Property of bhbdvm

• 20.4 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 Denali Ultimate Automatic 10 Speed Crew Cab Pickup
  Added Apr 2025 • 6 Fuel-ups

  Property of kkirby1027

• 24.2 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 Denali
  Added Jan 2025 • 27 Fuel-ups

  Property of ValiantV

• 23.2 Avg MPG

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