Based on data from 66 vehicles, 4,876 fuel-ups and 1,447,826 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 (1.55%) removed.

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

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• GMC Sierra

  2003 GMC Sierra 2500 HD SLT 8.1L V8 GAS Automatic 5 Speed
  Added Sep 2016 • 93 Fuel-ups

  Property of riverwake

• 8.5 Avg MPG

• My Sierra 2500 HD

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

  Property of wsafford

• 11.7 Avg MPG

• Mitch

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Feb 2018 • 242 Fuel-ups

  Property of minimill

• 12.4 Avg MPG

• Work Truck

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed Extended Cab Pickup
  Added May 2014 • 173 Fuel-ups

  Property of RayC

• 15.1 Avg MPG

• Tammy

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 5 Speed
  Added Jun 2017 • 20 Fuel-ups

  Property of kiefnuts

• 7.4 Avg MPG

• Sierra Duramax

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Mar 2014 • 26 Fuel-ups

  Property of fredscool

• 12.8 Avg MPG

• Butch

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Jul 2017 • 10 Fuel-ups

  Property of KreyKeele

• 14.5 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

• 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

• 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

• 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

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 5 Speed
  Added May 2016 • 4 Fuel-ups

  Property of SuperrDave

• 16.9 Avg MPG

• Gas Hog

  2003 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2015 • 11 Fuel-ups

  Property of vskid3

• 12.5 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L DIESEL V8 Automatic 5 Cab & Chassis (4 Door)
  Added Jan 2015 • 9 Fuel-ups

  Property of khansen_Dmax

• 15.6 Avg MPG

• Truck

  2003 GMC Sierra 2500 HD SLE 6.6L DIESEL V8 Automatic 5 Extended Cab Pickup (4 Door)
  Added Apr 2015 • 10 Fuel-ups

  Property of mdirkes530

• 20.0 Avg MPG

• Truck

  2003 GMC Sierra 2500 HD GAS V8
  Added Aug 2009 • 139 Fuel-ups

  Property of wera803

• 11.4 Avg MPG

• GMC Truck

  2003 GMC Sierra 2500 HD SLE 6.6L DIESEL V8 Automatic 5 Crew Cab Pickup (4 Door)
  Added Sep 2014 • 3 Fuel-ups

  Property of brandorm

• 12.9 Avg MPG

• Ed's GMC

  2003 GMC Sierra 2500 HD SLT 6.6L DIESEL V8 Automatic 5 Crew Cab Pickup (4 Door)
  Added Oct 2014 • 3 Fuel-ups

  Property of Edlandry

• 14.5 Avg MPG

• Torque Monster

  2003 GMC Sierra 2500 HD DIESEL V8
  Added Apr 2011 • 21 Fuel-ups

  Property of Roolet

• 15.2 Avg MPG

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