Based on data from 247 vehicles, 16,978 fuel-ups and 6,450,372 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.28 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (159) 5.3L V8 GAS (49) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (61) Cab & Chassis - Crew Cab (3) Any Submodel SLE (10) SLT (37) Denali (43) Elevation (60) AT4 (97)

Below you can see a distribution of the fuel-ups with 91 outliers (0.53%) removed.

Following shows the average MPG of each of the 247 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2024 • 48 Fuel-ups

  Property of BigBoostDSM

• 15.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 50 Fuel-ups

  Property of snoogans7031

• 17.0 Avg MPG

• Sierra

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2023 • 36 Fuel-ups

  Property of alex10haken

• 21.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 65 Fuel-ups

  Property of steamroller69633

• 15.6 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 27 Fuel-ups

  Property of Roy2Chin

• 18.7 Avg MPG

• Lucille

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 37 Fuel-ups

  Property of kwhight

• 18.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 55 Fuel-ups

  Property of MLTGMC

• 26.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 63 Fuel-ups

  Property of jcg2009

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 38 Fuel-ups

  Property of Griffis89

• 20.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 98 Fuel-ups

  Property of johnoutdoors

• 21.6 Avg MPG

• Her Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 74 Fuel-ups

  Property of davisfarm86

• 21.9 Avg MPG

• My GMC Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 88 Fuel-ups

  Property of ndodge3

• 27.1 Avg MPG

• Clay 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2021 • 100 Fuel-ups

  Property of chriii

• 13.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 113 Fuel-ups

  Property of travreed22

• 23.2 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

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 40 Fuel-ups

  Property of burkian

• 25.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 87 Fuel-ups

  Property of Istijour

• 23.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 72 Fuel-ups

  Property of crowan43

• 21.6 Avg MPG

• 2021 GMC Sierra SLT 1500 4WD

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 29 Fuel-ups

  Property of blrains706

• 24.0 Avg MPG

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 100 Fuel-ups

  Property of DCsells

• 14.1 Avg MPG

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