Based on data from 240 vehicles, 15,296 fuel-ups and 5,828,332 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.31 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (157) 5.3L V8 GAS (45) 6.2L V8 GAS (27) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (59) Cab & Chassis - Crew Cab (3) Any Submodel SLE (9) SLT (35) Denali (43) Elevation (58) AT4 (95)

Below you can see a distribution of the fuel-ups with 85 outliers (0.55%) removed.

Following shows the average MPG of each of the 240 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 64 Fuel-ups

  Property of crowan43

• 21.8 Avg MPG

• White Walker

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 43 Fuel-ups

  Property of imca35

• 22.5 Avg MPG

• 2021 Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 138 Fuel-ups

  Property of craigw76

• 18.6 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 203 Fuel-ups

  Property of ahartman

• 16.5 Avg MPG

• Sasha 2

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Apr 2021 • 113 Fuel-ups

  Property of fides893

• 18.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 162 Fuel-ups

  Property of yesubyllib

• 23.2 Avg MPG

• Yodha

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Oct 2021 • 129 Fuel-ups

  Property of YODHA

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 31 Fuel-ups

  Property of stevengross

• 18.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed
  Added Jun 2022 • 94 Fuel-ups

  Property of jctoss32986

• 13.4 Avg MPG

• My GMC Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 77 Fuel-ups

  Property of ndodge3

• 27.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 115 Fuel-ups

  Property of jmartinezflyer

• 15.7 Avg MPG

• 2021 Sierra Diesel

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Cab & Chassis - Crew Cab
  Added Oct 2021 • 97 Fuel-ups

  Property of Mooseman2

• 21.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 102 Fuel-ups

  Property of wholyon

• 17.9 Avg MPG

• 2021 GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 77 Fuel-ups

  Property of GlenatTBP

• 23.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 92 Fuel-ups

  Property of mastrodan3rd

• 17.3 Avg MPG

• GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 128 Fuel-ups

  Property of Slugster

• 24.0 Avg MPG

• His Sierra 1500 AT4 Farm Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 80 Fuel-ups

  Property of davisfarm86

• 18.9 Avg MPG

• 2021 GMC Sierra SLT 1500 4WD

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 22 Fuel-ups

  Property of blrains706

• 24.1 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 23 Fuel-ups

  Property of kwhight

• 18.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 49 Fuel-ups

  Property of MLTGMC

• 26.7 Avg MPG

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