Based on data from 64 vehicles, 5,169 fuel-ups and 1,463,269 miles of driving, the 2003 GMC Sierra 1500 gets a combined Avg MPG of 14.21 with a 0.08 MPG margin of error.

Any Engine Type 4.3L V6 GAS (6) 4.8L V8 GAS (15) 5.3L V8 GAS (26) 6.0L V8 GAS (3) GAS (1) V6 GAS (1) V8 GAS (7) Any Body Style Standard Cab Pickup (3) Extended Cab Pickup (8) Any Submodel WT (2) SL (3) Denali (3) Base (7) SLT (11) SLE (28) Other (10)

Below you can see a distribution of the fuel-ups with 263 outliers (4.84%) removed.

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

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• GMC 2003

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2020 • 57 Fuel-ups

  Property of XLR8260

• 14.0 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2021 • 4 Fuel-ups

  Property of sammyiammy

• 9.3 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2019 • 78 Fuel-ups

  Property of Reeves89

• 14.5 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 4.3L V6 GAS Automatic 4 Speed
  Added Mar 2018 • 59 Fuel-ups

  Property of jasonmdecker

• 17.7 Avg MPG

• 2003 Sierra 1500

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 131 Fuel-ups

  Property of Sandhopper

• 14.4 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2016 • 104 Fuel-ups

  Property of bradk4687

• 13.5 Avg MPG

• 2003 GMC

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Oct 2017 • 140 Fuel-ups

  Property of Rivera

• 19.8 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 Denali 6.0L V8 GAS Automatic 4 Speed
  Added Feb 2021 • 6 Fuel-ups

  Property of TyGordon

• 11.8 Avg MPG

• Truck 4x4 extended cab

  2003 GMC Sierra 1500
  Added Mar 2013 • 84 Fuel-ups

  Property of bernermobile

• 16.1 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2020 • 25 Fuel-ups

  Property of afi1

• 17.3 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Jul 2017 • 82 Fuel-ups

  Property of zaomaster

• 14.8 Avg MPG

• Sierra

  2003 GMC Sierra 1500 SLT 4.8L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 120 Fuel-ups

  Property of reknigh

• 13.4 Avg MPG

• Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jun 2018 • 30 Fuel-ups

  Property of Parsonrick

• 15.6 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added May 2019 • 6 Fuel-ups

  Property of zac_parker88

• 15.8 Avg MPG

• Truck

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Mar 2018 • 56 Fuel-ups

  Property of SlammerAngel

• 12.8 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 Denali 6.0L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 18 Fuel-ups

  Property of jsills

• 7.8 Avg MPG

• GMC Seirra

  2003 GMC Sierra 1500 SL
  Added Apr 2018 • 105 Fuel-ups

  Property of ve3kaw

• 14.6 Avg MPG

• GMC Sierra

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Oct 2014 • 730 Fuel-ups

  Property of ScrapIT

• 15.0 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jan 2018 • 10 Fuel-ups

  Property of midsouthgeek

• 12.0 Avg MPG

• Big birtha

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 33 Fuel-ups

  Property of evansutton17

• 12.2 Avg MPG

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