Based on data from 17 vehicles, 109 fuel-ups and 43,799 miles of driving, the 2025 GMC Sierra 1500 gets a combined Avg MPG of 22.59 with a 1.16 MPG margin of error.

Any Engine Type DIESEL (2) L6 DIESEL (5) V8 GAS (2) Any Body Style Standard Cab Pickup (2) Crew Cab Pickup (6) Any Submodel AT4X (3) Denali Ultimate (4) Other (10)

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 17 vehicles in the system.

• Gray Ghost

  2025 GMC Sierra 1500 Denali Ultimate L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 15 Fuel-ups

  Property of Neurobit

• 27.3 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 Denali
  Added Jan 2025 • 20 Fuel-ups

  Property of ValiantV

• 23.5 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 AT4X
  Added Feb 2025 • 11 Fuel-ups

  Property of bhbdvm

• 20.7 Avg MPG

• Mike’s 2025 Denali

  2025 GMC Sierra 1500 Denali Ultimate
  Added Jan 2025 • 8 Fuel-ups

  Property of Mikecompton

• 20.2 Avg MPG

• Ultimate

  2025 GMC Sierra 1500 Denali Ultimate V8 GAS Automatic 10 Speed Standard Cab Pickup
  Added Mar 2025 • 4 Fuel-ups

  Property of wjschettino

• 16.5 Avg MPG

• GMC Truck

  2025 GMC Sierra 1500 Denali
  Added Feb 2025 • 10 Fuel-ups

  Property of gmpearl

• 28.2 Avg MPG

• My 2025 GMC AT4

  2025 GMC Sierra 1500 AT4X
  Added Mar 2025 • 4 Fuel-ups

  Property of dherring

• 20.0 Avg MPG

• Truck

  2025 GMC Sierra 1500 AT4 L6 DIESEL
  Added Mar 2025 • 4 Fuel-ups

  Property of stv718

• 21.5 Avg MPG

• My Sierra 1500 (max tow)

  2025 GMC Sierra 1500 Elevation L6 DIESEL Automatic 10 Speed
  Added Jan 2025 • 6 Fuel-ups

  Property of ccorndogg

• 28.3 Avg MPG

• 2025 1500

  2025 GMC Sierra 1500 Elevation DIESEL
  Added Mar 2025 • 4 Fuel-ups

  Property of edwin191

• 24.0 Avg MPG

• 2025 Sierra 1500 SLT

  2025 GMC Sierra 1500 SLT DIESEL Automatic 10 Speed
  Added Mar 2025 • 4 Fuel-ups

  Property of svitale1

• 25.5 Avg MPG

• Kevin’s GMC

  2025 GMC Sierra 1500 SLT Automatic 10 Speed
  Added Dec 2024 • 9 Fuel-ups

  Property of kevinharper9

• 18.5 Avg MPG

• Sierra 1500

  2025 GMC Sierra 1500 Elevation L6 DIESEL
  Added Feb 2025 • 4 Fuel-ups

  Property of mikemeis

• 25.5 Avg MPG

• Blurple

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

  Property of cablebandit

• 24.3 Avg MPG

• AT4 GMC 2025

  2025 GMC Sierra 1500 AT4 V8 GAS Automatic 10 Speed
  Added Jan 2025 • 9 Fuel-ups

  Property of Lanners

• 14.2 Avg MPG

• ‘25 GMC AT4X

  2025 GMC Sierra 1500 AT4X
  Added Jan 2025 • 6 Fuel-ups

  Property of XtraTQ

• 18.6 Avg MPG

• 2025 Denali Ultimate

  2025 GMC Sierra 1500 Denali Ultimate
  Added Jan 2025 • 3 Fuel-ups

  Property of reece650

• 15.0 Avg MPG