Based on data from 25 vehicles, 444 fuel-ups and 142,981 miles of driving, the 2025 GMC Sierra 2500 HD gets a combined Avg MPG of 13.44 with a 0.28 MPG margin of error.

Any Engine Type DIESEL (1) L8 DIESEL (2) V8 DIESEL (4) V8 GAS (2) Any Body Style Crew Cab Pickup (11) Cab & Chassis - Crew Cab (1) Any Submodel Pro (1) SLE (4) SLT (6) AT4 (8) Other (6)

Below you can see a distribution of the fuel-ups with 8 outliers (1.77%) removed.

Following shows the average MPG of each of the 25 vehicles in the system.

• «
• 1
• 2
• »

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD AT4
  Added Sep 2025 • 26 Fuel-ups

  Property of jg1904

• 16.5 Avg MPG

• GMC Sierra 2500 HD

  2025 GMC Sierra 2500 HD Denali L8 DIESEL
  Added Oct 2025 • 11 Fuel-ups

  Property of lowellburkholder

• 13.2 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD AT4
  Added Aug 2025 • 27 Fuel-ups

  Property of volcandiesel

• 15.7 Avg MPG

• GMC Sierra

  2025 GMC Sierra 2500 HD Denali Ultimate V8 DIESEL
  Added May 2025 • 23 Fuel-ups

  Property of MikeWas

• 17.3 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD SLT
  Added Mar 2025 • 9 Fuel-ups

  Property of Superdawg

• 11.4 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD SLT
  Added Jul 2025 • 25 Fuel-ups

  Property of jtlp8335

• 13.6 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD SLT
  Added Mar 2025 • 10 Fuel-ups

  Property of LawMan02

• 11.8 Avg MPG

• GMC 2500 HD AT4

  2025 GMC Sierra 2500 HD AT4 Automatic 10 Speed
  Added Dec 2024 • 49 Fuel-ups

  Property of machzender

• 15.4 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD AT4
  Added Aug 2025 • 24 Fuel-ups

  Property of Rottozip

• 14.8 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD AT4
  Added Nov 2025 • 10 Fuel-ups

  Property of marztian

• 15.1 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD SLE
  Added Jul 2025 • 19 Fuel-ups

  Property of whitewhite

• 13.5 Avg MPG

• Whitey

  2025 GMC Sierra 2500 HD SLT Automatic 10 Speed Crew Cab Pickup
  Added Feb 2025 • 36 Fuel-ups

  Property of Triple6T666

• 12.9 Avg MPG

• 2025 Sierra 2500 HD

  2025 GMC Sierra 2500 HD AT4
  Added Sep 2025 • 4 Fuel-ups

  Property of webbman81

• 14.9 Avg MPG

• 2025 GMC

  2025 GMC Sierra 2500 HD AT4 L8 DIESEL Automatic 8 Speed Cab & Chassis - Crew Cab
  Added Sep 2025 • 6 Fuel-ups

  Property of jr32313

• 13.7 Avg MPG

• GMC 2500

  2025 GMC Sierra 2500 HD SLE Automatic 10 Speed Crew Cab Pickup
  Added Feb 2025 • 33 Fuel-ups

  Property of SoloRX7

• 12.1 Avg MPG

• 25 AT4X

  2025 GMC Sierra 2500 HD At4x
  Added Mar 2025 • 27 Fuel-ups

  Property of tritz4

• 13.0 Avg MPG

• JKM DuraMax

  2025 GMC Sierra 2500 HD AT4 DIESEL Automatic 10 Speed
  Added Jan 2025 • 31 Fuel-ups

  Property of BigKen

• 11.6 Avg MPG

• GMC Sierra 2500 HD SLT

  2025 GMC Sierra 2500 HD SLT V8 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2025 • 16 Fuel-ups

  Property of jim396

• 12.0 Avg MPG

• My Sierra 2500 HD

  2025 GMC Sierra 2500 HD AT4
  Added Aug 2025 • 6 Fuel-ups

  Property of Redat42024

• 14.8 Avg MPG

• Big Blue GMC

  2025 GMC Sierra 2500 HD Pro V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2025 • 7 Fuel-ups

  Property of pittim77

• 13.6 Avg MPG

• «
• 1
• 2
• »