Based on data from 66 vehicles, 4,873 fuel-ups and 1,446,946 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 (2) 6.0L V8 GAS (9) 6.6L V8 DIESEL (43) 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 (23) SLT (27) Other (7)

Below you can see a distribution of the fuel-ups with 77 outliers (1.56%) removed.

Following shows the average MPG of each of the 66 vehicles in the system.

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• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2018 • 327 Fuel-ups

  Property of timp1968

• 16.0 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed
  Added Feb 2024 • 19 Fuel-ups

  Property of Ben_buggy

• 8.8 Avg MPG

• Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2021 • 52 Fuel-ups

  Property of HoundzRig

• 15.2 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Jul 2017 • 159 Fuel-ups

  Property of G1974

• 17.7 Avg MPG

• Chanchito

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 156 Fuel-ups

  Property of davidrperkins

• 14.5 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Feb 2013 • 287 Fuel-ups

  Property of DAVe3283

• 15.3 Avg MPG

• GMC Sierra 2500 HD 2003

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2024 • 25 Fuel-ups

  Property of ScooterMann

• 17.6 Avg MPG

• GMC 2500hd

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 54 Fuel-ups

  Property of mdw612

• 15.7 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD WT 8.1L V8 GAS Automatic 4 Speed
  Added Oct 2023 • 7 Fuel-ups

  Property of chapdou

• 9.5 Avg MPG

• GMC Duramax

  2003 GMC Sierra 2500 HD SLE
  Added Jun 2018 • 256 Fuel-ups

  Property of main1

• 14.1 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

• GMC Sierra 2500HD

  2003 GMC Sierra 2500 HD SLE 8.1L V8 GAS Automatic 5 Speed Crew Cab Pickup
  Added Jan 2019 • 373 Fuel-ups

  Property of nmartens09

• 9.3 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Feb 2024 • 6 Fuel-ups

  Property of Ideracing7

• 14.0 Avg MPG

• Sierra

  2003 GMC Sierra 2500 HD SLE
  Added Jul 2023 • 50 Fuel-ups

  Property of Erich309

• 17.2 Avg MPG

• Truck

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL
  Added Feb 2021 • 257 Fuel-ups

  Property of dusty123456

• 19.0 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.0L V8 CNG Automatic 4 Speed
  Added Jun 2024 • 7 Fuel-ups

  Property of albert7700

• 10.8 Avg MPG

• Gmc Truck

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL
  Added Oct 2017 • 196 Fuel-ups

  Property of jfyoung11

• 14.4 Avg MPG

• DMax

  2003 GMC Sierra 2500 HD SLT 6.0L V8 CNG Automatic 4 Speed
  Added Sep 2022 • 56 Fuel-ups

  Property of BowManGuardian

• 15.2 Avg MPG

• Dad's Truck

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Apr 2021 • 142 Fuel-ups

  Property of dlindval

• 12.9 Avg MPG

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