Based on data from 40 vehicles, 1,736 fuel-ups and 529,084 miles of driving, the 2003 GMC Sierra 2500 HD gets a combined Avg MPG of 14.71 with a 0.17 MPG margin of error.

Any Engine Type 6.0L V8 GAS (5) 6.6L V8 DIESEL (26) 8.1L V8 GAS (1) V8 DIESEL (4) V8 GAS (4) Any Body Style Extended Cab Pickup (4) Crew Cab Pickup (4) Any Submodel WT (1) Base (4) SLE (13) SLT (15) Other (7)

Below you can see a distribution of the fuel-ups with 26 outliers (1.48%) removed.

Following shows the average MPG of each of the 40 vehicles in the system.

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• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 4 Speed
  Added May 2017 • 21 Fuel-ups

  Property of Mpmcnasty

• 16.8 Avg MPG

• 2500HD

  2003 GMC Sierra 2500 HD GAS V8
  Added Jun 2013 • 92 Fuel-ups

  Property of M42E36

• 13.2 Avg MPG

• Butch

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Jul 2017 • 7 Fuel-ups

  Property of KreyKeele

• 11.4 Avg MPG

• Oliver

  2003 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 5 Speed
  Added Mar 2017 • 38 Fuel-ups

  Property of 100percentderby

• 12.3 Avg MPG

• Work Truck

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed Extended Cab Pickup
  Added May 2014 • 159 Fuel-ups

  Property of RayC

• 15.4 Avg MPG

• Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Dec 2016 • 15 Fuel-ups

  Property of jmeier301

• 14.4 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed
  Added Jul 2017 • 5 Fuel-ups

  Property of wsafford

• 12.7 Avg MPG

• Tammy

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 5 Speed
  Added Jun 2017 • 18 Fuel-ups

  Property of kiefnuts

• 6.8 Avg MPG

• Red Duramax

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 21 Fuel-ups

  Property of wdkgecko

• 17.5 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Feb 2013 • 203 Fuel-ups

  Property of DAVe3283

• 16.0 Avg MPG

• 2003 GMC

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

  Property of racerx146

• 13.7 Avg MPG

• Rick

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Sep 2016 • 259 Fuel-ups

  Property of d800306

• 16.0 Avg MPG

• 2003 GMC Sierra Duramax

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 5 Speed Extended Cab Pickup
  Added Feb 2017 • 21 Fuel-ups

  Property of srlew

• 15.6 Avg MPG

• The DIRTY

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Dec 2014 • 125 Fuel-ups

  Property of 10janderson3

• 14.6 Avg MPG

• My Sierra 2500 HD

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

  Property of G1974

• 17.4 Avg MPG

• Sierra Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Mar 2014 • 23 Fuel-ups

  Property of fredscool

• 12.9 Avg MPG

• My Sierra 2500 HD

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

  Property of mybluetruck

• 15.4 Avg MPG

• GMC Sierra

  2003 GMC Sierra 2500 HD SLT 8.1L V8 GAS Automatic 5 Speed
  Added Sep 2016 • 88 Fuel-ups

  Property of riverwake

• 8.3 Avg MPG

• Truck

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jun 2017 • 11 Fuel-ups

  Property of Baldwin93

• 12.3 Avg MPG

• Blackie

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Aug 2013 • 119 Fuel-ups

  Property of HernsNerd

• 14.3 Avg MPG

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