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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• My Sierra with new dash

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Dec 2020 • 29 Fuel-ups

  Property of MEMatta

• 14.9 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

• 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

• 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

• 2500HD

  2003 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 4 Speed
  Added Jun 2013 • 252 Fuel-ups

  Property of M42E36

• 12.9 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Feb 2020 • 32 Fuel-ups

  Property of MEMatta

• 14.8 Avg MPG

• GMC

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added May 2021 • 9 Fuel-ups

  Property of Mick-Bonscott

• 14.2 Avg MPG

• My Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 4 Speed
  Added Mar 2021 • 4 Fuel-ups

  Property of themightyredchili

• 18.5 Avg MPG

• GMC Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Aug 2019 • 34 Fuel-ups

  Property of Bernie2922

• 15.0 Avg MPG

• Dad's Truck Duplicate

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Aug 2019 • 84 Fuel-ups

  Property of dlindval

• 13.2 Avg MPG

• 03 GMC Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Nov 2016 • 74 Fuel-ups

  Property of Suncoaster

• 19.5 Avg MPG

• ‘Max

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed
  Added Nov 2018 • 69 Fuel-ups

  Property of petertimmer1

• 13.0 Avg MPG

• The DIRTY

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Dec 2014 • 189 Fuel-ups

  Property of 10janderson3

• 14.7 Avg MPG

• Duramax

  2003 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Jul 2018 • 23 Fuel-ups

  Property of Dirtyblackhoe

• 15.0 Avg MPG

• 2003 Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Standard 6 Speed
  Added Dec 2017 • 73 Fuel-ups

  Property of polarxj

• 17.3 Avg MPG

• Blackie

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Aug 2013 • 130 Fuel-ups

  Property of HernsNerd

• 14.4 Avg MPG

• Oliver

  2003 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 5 Speed
  Added Mar 2017 • 57 Fuel-ups

  Property of 100percentderby

• 11.4 Avg MPG

• DirtyMAX

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed Crew Cab Pickup
  Added Jul 2018 • 22 Fuel-ups

  Property of SirRoland

• 14.0 Avg MPG

• Sierra 2500 HD

  2003 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 5 Speed
  Added Dec 2016 • 39 Fuel-ups

  Property of jmeier301

• 14.9 Avg MPG

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