Based on data from 35 vehicles, 1,650 fuel-ups and 505,368 miles of driving, the 2003 GMC Sierra 2500 HD gets a combined Avg MPG of 14.78 with a 0.17 MPG margin of error.

Any Engine Type 6.0L V8 GAS (4) 6.6L V8 DIESEL (22) 8.1L V8 GAS (1) V8 DIESEL (4) V8 GAS (4) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (4) Any Submodel WT (1) Base (4) SLE (10) SLT (13) Other (7)

Below you can see a distribution of the fuel-ups with 22 outliers (1.32%) removed.

Following shows the average MPG of each of the 35 vehicles in the system.

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• Truck

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jun 2017 • 9 Fuel-ups

  Property of Baldwin93

• 12.3 Avg MPG

• GMC 2500hd

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 23 Fuel-ups

  Property of mdw612

• 20.3 Avg MPG

• Red Duramax

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 14 Fuel-ups

  Property of wdkgecko

• 17.2 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Feb 2013 • 193 Fuel-ups

  Property of DAVe3283

• 16.1 Avg MPG

• 03 GMC Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Nov 2016 • 9 Fuel-ups

  Property of Suncoaster

• 16.3 Avg MPG

• Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Dec 2016 • 13 Fuel-ups

  Property of jmeier301

• 14.5 Avg MPG

• Tammy

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 5 Speed
  Added Jun 2017 • 5 Fuel-ups

  Property of kiefnuts

• 10.1 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 4 Speed
  Added May 2017 • 11 Fuel-ups

  Property of Mpmcnasty

• 17.1 Avg MPG

• Work Truck

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2014 • 150 Fuel-ups

  Property of RayC

• 15.3 Avg MPG

• GMC Sierra

  2003 GMC Sierra 2500 HD SLT 8.1L V8 GAS Automatic 5 Speed
  Added Sep 2016 • 85 Fuel-ups

  Property of riverwake

• 8.4 Avg MPG

• 2003 GMC Sierra Duramax

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 5 Speed Extended Cab Pickup
  Added Feb 2017 • 18 Fuel-ups

  Property of srlew

• 15.0 Avg MPG

• 2500HD

  2003 GMC Sierra 2500 HD GAS V8
  Added Jun 2013 • 85 Fuel-ups

  Property of M42E36

• 13.5 Avg MPG

• Oliver

  2003 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 5 Speed
  Added Mar 2017 • 33 Fuel-ups

  Property of 100percentderby

• 12.4 Avg MPG

• Blackie

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Aug 2013 • 116 Fuel-ups

  Property of HernsNerd

• 14.4 Avg MPG

• The DIRTY

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Dec 2014 • 118 Fuel-ups

  Property of 10janderson3

• 14.8 Avg MPG

• Rick

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 258 Fuel-ups

  Property of d800306

• 16.0 Avg MPG

• 2003 GMC

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 46 Fuel-ups

  Property of racerx146

• 13.7 Avg MPG

• Sierra Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Mar 2014 • 22 Fuel-ups

  Property of fredscool

• 13.1 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2017 • 3 Fuel-ups

  Property of helicopterhernan

• 14.1 Avg MPG

• 2003 GMC

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 4 Speed
  Added Aug 2016 • 295 Fuel-ups

  Property of speck70001

• 18.0 Avg MPG

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