Based on data from 69 vehicles, 4,950 fuel-ups and 1,471,766 miles of driving, the 2003 GMC Sierra 2500 HD gets a combined Avg MPG of 14.16 with a 0.12 MPG margin of error.

Any Engine Type 6.0L V8 CNG (3) 6.0L V8 GAS (9) 6.6L V8 DIESEL (45) 8.1L V8 GAS (3) V8 DIESEL (4) V8 GAS (3) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (4) Crew Cab Pickup (8) Any Submodel WT (2) Base (7) SLE (24) SLT (29) Other (7)

Below you can see a distribution of the fuel-ups with 78 outliers (1.55%) removed.

Following shows the average MPG of each of the 69 vehicles in the system.

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• 2003 Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Dec 2024 • 3 Fuel-ups

  Property of gjonesy12

• 13.5 Avg MPG

• Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2021 • 61 Fuel-ups

  Property of HoundzRig

• 15.0 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2018 • 367 Fuel-ups

  Property of timp1968

• 16.0 Avg MPG

• Maria

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2025 • 33 Fuel-ups

  Property of tempslik

• 14.9 Avg MPG

• GMC Duramax

  2003 GMC Sierra 2500 HD SLE
  Added Jun 2018 • 259 Fuel-ups

  Property of main1

• 14.1 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.0L V8 CNG Automatic 4 Speed
  Added Oct 2024 • 3 Fuel-ups

  Property of aaron9067

• 19.9 Avg MPG

• Sierra

  2003 GMC Sierra 2500 HD SLE
  Added Jul 2023 • 52 Fuel-ups

  Property of Erich309

• 17.2 Avg MPG

• Blackie

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Aug 2013 • 132 Fuel-ups

  Property of HernsNerd

• 14.3 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Jul 2017 • 161 Fuel-ups

  Property of G1974

• 17.7 Avg MPG

• GMC 2500hd

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 57 Fuel-ups

  Property of mdw612

• 15.8 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Feb 2024 • 12 Fuel-ups

  Property of Ideracing7

• 11.6 Avg MPG

• Chanchito

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 164 Fuel-ups

  Property of davidrperkins

• 14.2 Avg MPG

• Gmc Truck

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL
  Added Oct 2017 • 197 Fuel-ups

  Property of jfyoung11

• 14.3 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Feb 2013 • 292 Fuel-ups

  Property of DAVe3283

• 15.3 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed
  Added Feb 2024 • 21 Fuel-ups

  Property of Ben_buggy

• 9.1 Avg MPG

• GMC Sierra 2500 HD 2003

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2024 • 27 Fuel-ups

  Property of ScooterMann

• 17.8 Avg MPG

• GMC Sierra 2500HD

  2003 GMC Sierra 2500 HD SLE 8.1L V8 GAS Automatic 5 Speed Crew Cab Pickup
  Added Jan 2019 • 374 Fuel-ups

  Property of nmartens09

• 9.3 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD WT 8.1L V8 GAS Automatic 4 Speed
  Added Oct 2023 • 8 Fuel-ups

  Property of chapdou

• 9.4 Avg MPG

• Sierra

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 185 Fuel-ups

  Property of 2xGrey

• 16.7 Avg MPG

• GMC Sierra 2500 HD (2003)

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 16 Fuel-ups

  Property of dlr007

• 10.7 Avg MPG

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