Based on data from 64 vehicles, 5,168 fuel-ups and 1,463,007 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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• My Sierra 1500

  2003 GMC Sierra 1500 4.8L V8 GAS Automatic 4 Speed
  Added Sep 2024 • 29 Fuel-ups

  Property of luigi151

• 17.3 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 4.8L V8 GAS Automatic 4 Speed
  Added Jul 2024 • 14 Fuel-ups

  Property of j81647362

• 16.2 Avg MPG

• Paw's Truck - GMC Sierra

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Mar 2021 • 65 Fuel-ups

  Property of JyRO

• 17.1 Avg MPG

• Norman

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2016 • 45 Fuel-ups

  Property of BiannualPoet

• 15.2 Avg MPG

• 2003 GMC Sierra Z71

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Nov 2023 • 352 Fuel-ups

  Property of ddaongam

• 12.8 Avg MPG

• GMC Sierra

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2016 • 70 Fuel-ups

  Property of jsstreet

• 12.3 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Jun 2022 • 57 Fuel-ups

  Property of scoot252

• 15.0 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2021 • 107 Fuel-ups

  Property of burge

• 14.8 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 4.3L V6 GAS Automatic 4 Speed
  Added Dec 2018 • 145 Fuel-ups

  Property of LockeCars

• 13.6 Avg MPG

• Shela

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Aug 2020 • 152 Fuel-ups

  Property of Seriph

• 15.5 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 551 Fuel-ups

  Property of thecellarseller

• 15.3 Avg MPG

• 2003 GMC

  2003 GMC Sierra 1500 4.8L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 20 Fuel-ups

  Property of hornerr2722

• 24.1 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2020 • 143 Fuel-ups

  Property of killerkody

• 17.0 Avg MPG

• 2003 Sierra

  2003 GMC Sierra 1500 WT 5.3L V8 GAS Automatic 4 Speed
  Added May 2019 • 74 Fuel-ups

  Property of jacmohr

• 15.1 Avg MPG

• 2003 GMC Sierra Z71

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jan 2018 • 326 Fuel-ups

  Property of ddaongam

• 12.8 Avg MPG

• GMC 2003

  2003 GMC Sierra 1500 SLE
  Added Feb 2021 • 425 Fuel-ups

  Property of HRan

• 16.9 Avg MPG

• Denali

  2003 GMC Sierra 1500 Denali 6.0L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 261 Fuel-ups

  Property of Murray66

• 12.2 Avg MPG

• My Sierra 1500

  2003 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2023 • 6 Fuel-ups

  Property of Tysont

• 24.0 Avg MPG

• GMC

  2003 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2018 • 414 Fuel-ups

  Property of gwlayman

• 16.2 Avg MPG

• Z71

  2003 GMC Sierra 1500 SLT 5.3L GAS V8 Automatic 4 Extended Cab Pickup (4 Door)
  Added Sep 2014 • 143 Fuel-ups

  Property of 5bassman

• 11.3 Avg MPG

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