Based on data from 64 vehicles, 5,418 fuel-ups and 1,534,778 miles of driving, the 2003 GMC Sierra 1500 gets a combined Avg MPG of 14.20 with a 0.08 MPG margin of error.

Any Engine Type 4.3L V6 GAS (6) 4.8L V8 GAS (14) 5.3L V8 GAS (27) 6.0L V8 GAS (3) GAS (1) V6 GAS (1) V8 GAS (7) Any Body Style Standard Cab Pickup (3) Extended Cab Pickup (9) Any Submodel WT (2) SL (3) Denali (3) Base (5) SLT (11) SLE (30) Other (10)

Below you can see a distribution of the fuel-ups with 311 outliers (5.43%) removed.

Following shows the average MPG of each of the 64 vehicles in the system.

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• Truck

  2003 GMC Sierra 1500 WT 4.3L V6 GAS Extended Cab Pickup
  Added Oct 2017 • 95 Fuel-ups

  Property of Rhawkins

• 16.1 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Feb 2018 • 29 Fuel-ups

  Property of drs3

• 15.9 Avg MPG

• Dad's Truck

  2003 GMC Sierra 1500 4.3L V6 GAS Standard 5 Speed Standard Cab Pickup
  Added Jan 2018 • 15 Fuel-ups

  Property of faultlined

• 16.3 Avg MPG

• Sierra

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Feb 2016 • 85 Fuel-ups

  Property of s_hassell97

• 14.6 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Standard 5 Speed
  Added Jan 2016 • 18 Fuel-ups

  Property of clark62

• 17.8 Avg MPG

• Sierra

  2003 GMC Sierra 1500 SLT Extended Cab Pickup
  Added Oct 2017 • 14 Fuel-ups

  Property of rickels

• 15.6 Avg MPG

• 2003 GMC Sierra

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 251 Fuel-ups

  Property of bdow718

• 14.6 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2016 • 7 Fuel-ups

  Property of RidgeDick

• 17.4 Avg MPG

• old blue

  2003 GMC Sierra 1500 GAS V6
  Added Mar 2014 • 84 Fuel-ups

  Property of km1360

• 15.3 Avg MPG

• GMC Sierra

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Oct 2017 • 30 Fuel-ups

  Property of abi2012

• 13.4 Avg MPG

• GMC Pickup

  2003 GMC Sierra 1500 SLE 4.3L V6 GAS Automatic 4 Speed
  Added Sep 2016 • 188 Fuel-ups

  Property of genebilltest

• 18.4 Avg MPG

• z Old gmc truck

  2003 GMC Sierra 1500 SL
  Added Apr 2018 • 143 Fuel-ups

  Property of ve3kaw

• 6.9 Avg MPG

• Sold - GMC

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 185 Fuel-ups

  Property of Fasgas

• 15.2 Avg MPG

• GMC Sierra

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Standard 5 Speed
  Added Nov 2016 • 79 Fuel-ups

  Property of troycole

• 21.3 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLT 5.3L GAS V8 Automatic 4 Extended Cab Pickup (4 Door)
  Added Mar 2015 • 5 Fuel-ups

  Property of Missingdeathbed

• 19.3 Avg MPG

• Truck

  2003 GMC Sierra 1500 GAS V8
  Added Jan 2013 • 44 Fuel-ups

  Property of Jaymere

• 16.1 Avg MPG

• Trailer Queen

  2003 GMC Sierra 1500 GAS V8
  Added Sep 2011 • 59 Fuel-ups

  Property of Bluedragon

• 16.3 Avg MPG

• GMC1500

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Aug 2017 • 5 Fuel-ups

  Property of murdoc2003

• 13.6 Avg MPG

• 2003 Gmc sierra 1500 5.3L 4x4

  2003 GMC Sierra 1500 GAS V8
  Added Jan 2013 • 3 Fuel-ups

  Property of BigBoy2112

• 9.6 Avg MPG

• Truck

  2003 GMC Sierra 1500 GAS V8
  Added May 2010 • 37 Fuel-ups

  Property of scotth20

• 13.9 Avg MPG

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