Based on data from 252 vehicles, 18,269 fuel-ups and 6,986,591 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.37 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (161) 5.3L V8 GAS (52) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (62) Cab & Chassis - Crew Cab (3) Any Submodel SLE (10) SLT (37) Denali (42) Elevation (61) AT4 (102)

Below you can see a distribution of the fuel-ups with 94 outliers (0.51%) removed.

Following shows the average MPG of each of the 252 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2023 • 5 Fuel-ups

  Property of Chrisb5597

• 25.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2023 • 120 Fuel-ups

  Property of gdmannjr

• 16.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 48 Fuel-ups

  Property of stevengross

• 19.6 Avg MPG

• Steve's Sierra

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Oct 2022 • 8 Fuel-ups

  Property of tosober

• 29.1 Avg MPG

• Stormtrooper AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 28 Fuel-ups

  Property of SoCalEco14

• 19.5 Avg MPG

• 2021 Sierra Diesel

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Cab & Chassis - Crew Cab
  Added Oct 2021 • 111 Fuel-ups

  Property of Mooseman2

• 20.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 123 Fuel-ups

  Property of jmartinezflyer

• 15.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 47 Fuel-ups

  Property of efsimm01

• 17.9 Avg MPG

• My AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2023 • 45 Fuel-ups

  Property of subsailor

• 14.8 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2023 • 25 Fuel-ups

  Property of l1tech

• 22.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2023 • 6 Fuel-ups

  Property of febp85

• 23.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2022 • 69 Fuel-ups

  Property of HOMEslice93

• 22.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2024 • 16 Fuel-ups

  Property of tross75

• 21.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2022 • 83 Fuel-ups

  Property of BDann

• 22.5 Avg MPG

• Z'21 GMC

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2022 • 33 Fuel-ups

  Property of tdguenth

• 24.9 Avg MPG

• 2021 Sierra Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2021 • 103 Fuel-ups

  Property of gfervin

• 16.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 127 Fuel-ups

  Property of tmac30075

• 16.4 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2022 • 98 Fuel-ups

  Property of DrYooper

• 23.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 92 Fuel-ups

  Property of combatrafter

• 22.3 Avg MPG

• 21 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2021 • 73 Fuel-ups

  Property of bhess19

• 22.2 Avg MPG

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