Based on data from 181 vehicles, 5,988 fuel-ups and 2,240,235 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.10 with a 0.15 MPG margin of error.

Any Engine Type 2.7L L4 GAS (5) 3.0L L6 DIESEL (120) 5.3L V8 GAS (33) 6.2L V8 GAS (23) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (47) Cab & Chassis - Crew Cab (3) Any Submodel SLE (6) SLT (27) Denali (29) Elevation (39) AT4 (80)

Below you can see a distribution of the fuel-ups with 20 outliers (0.33%) removed.

Following shows the average MPG of each of the 181 vehicles in the system.

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• Sierra

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2022 • 34 Fuel-ups

  Property of jc9995

• 25.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 37 Fuel-ups

  Property of 76109

• 18.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 20 Fuel-ups

  Property of muddernuker

• 23.1 Avg MPG

• Arnold

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 153 Fuel-ups

  Property of st333

• 13.8 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 37 Fuel-ups

  Property of yogi-bear

• 16.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 131 Fuel-ups

  Property of SilverSully83

• 25.0 Avg MPG

• GMC Blackout

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 38 Fuel-ups

  Property of brockon

• 20.3 Avg MPG

• Bigfoot

  2021 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 15 Fuel-ups

  Property of White-Denali

• 16.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2021 • 92 Fuel-ups

  Property of jblomseth

• 17.0 Avg MPG

• 21 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2021 • 23 Fuel-ups

  Property of bhess19

• 22.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 22 Fuel-ups

  Property of Istijour

• 23.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 96 Fuel-ups

  Property of jtowns

• 16.4 Avg MPG

• GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 25 Fuel-ups

  Property of Slugster

• 23.6 Avg MPG

• Work Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 100 Fuel-ups

  Property of ChasN5ZXN

• 22.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 76 Fuel-ups

  Property of Silverflash22

• 22.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 32 Fuel-ups

  Property of MoeD

• 23.8 Avg MPG

• GMC Sierra 1500 Elevation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 11 Fuel-ups

  Property of amtrak8

• 25.3 Avg MPG

• Sasha 2

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Apr 2021 • 46 Fuel-ups

  Property of fides893

• 15.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 85 Fuel-ups

  Property of John30563

• 24.0 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2021 • 65 Fuel-ups

  Property of avaag

• 16.1 Avg MPG

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