Based on data from 61 vehicles, 4,505 fuel-ups and 1,356,493 miles of driving, the 2003 GMC Sierra 2500 HD gets a combined Avg MPG of 14.03 with a 0.13 MPG margin of error.

Any Engine Type 6.0L V8 CNG (1) 6.0L V8 GAS (8) 6.6L V8 DIESEL (42) 8.1L V8 GAS (2) V8 DIESEL (4) V8 GAS (3) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (8) Any Submodel WT (1) Base (7) SLE (19) SLT (27) Other (7)

Below you can see a distribution of the fuel-ups with 76 outliers (1.66%) removed.

Following shows the average MPG of each of the 61 vehicles in the system.

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• DMax

  2003 GMC Sierra 2500 HD SLT 6.0L V8 CNG Automatic 4 Speed
  Added Sep 2022 • 25 Fuel-ups

  Property of BowManGuardian

• 15.4 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2018 • 285 Fuel-ups

  Property of timp1968

• 16.2 Avg MPG

• Gmc Truck

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL
  Added Oct 2017 • 190 Fuel-ups

  Property of jfyoung11

• 14.2 Avg MPG

• Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Mar 2021 • 37 Fuel-ups

  Property of HoundzRig

• 14.6 Avg MPG

• GMC

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Extended Cab Pickup
  Added Nov 2017 • 105 Fuel-ups

  Property of jim44

• 17.4 Avg MPG

• Sierra

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 175 Fuel-ups

  Property of 2xGrey

• 16.7 Avg MPG

• Dad's Truck

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Apr 2021 • 131 Fuel-ups

  Property of dlindval

• 12.8 Avg MPG

• GMC Sierra 2500HD

  2003 GMC Sierra 2500 HD SLE 8.1L V8 GAS Automatic 5 Speed Crew Cab Pickup
  Added Jan 2019 • 372 Fuel-ups

  Property of nmartens09

• 9.3 Avg MPG

• Chanchito

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 111 Fuel-ups

  Property of davidrperkins

• 14.0 Avg MPG

• GMC Duramax

  2003 GMC Sierra 2500 HD SLE
  Added Jun 2018 • 238 Fuel-ups

  Property of main1

• 14.0 Avg MPG

• Truck

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL
  Added Feb 2021 • 233 Fuel-ups

  Property of dusty123456

• 18.9 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Jul 2017 • 8 Fuel-ups

  Property of G1974

• 15.9 Avg MPG

• Plow Truck

  2003 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Nov 2022 • 3 Fuel-ups

  Property of allalaskan

• 5.1 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Feb 2013 • 273 Fuel-ups

  Property of DAVe3283

• 15.4 Avg MPG

• My Sierra with new dash

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Dec 2020 • 28 Fuel-ups

  Property of MEMatta

• 14.9 Avg MPG

• GMC 2500hd

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 50 Fuel-ups

  Property of mdw612

• 15.9 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 212 Fuel-ups

  Property of Mpmcnasty

• 16.8 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 12 Fuel-ups

  Property of dlr007

• 10.0 Avg MPG

• 2003 GMC Sierra Duramax

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 5 Speed Extended Cab Pickup
  Added Feb 2017 • 264 Fuel-ups

  Property of srlew

• 15.8 Avg MPG

• 2003 GMC 2500HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 118 Fuel-ups

  Property of racerx146

• 14.1 Avg MPG

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