Based on data from 249 vehicles, 17,735 fuel-ups and 6,765,287 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.33 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (160) 5.3L V8 GAS (50) 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 (60) AT4 (100)

Below you can see a distribution of the fuel-ups with 92 outliers (0.52%) removed.

Following shows the average MPG of each of the 249 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 57 Fuel-ups

  Property of jps4di

• 23.7 Avg MPG

• 2021 GMC Sierra SLT 1500 4WD

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 32 Fuel-ups

  Property of blrains706

• 23.9 Avg MPG

• Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2024 • 3 Fuel-ups

  Property of rendrog

• 23.5 Avg MPG

• My GMC Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 94 Fuel-ups

  Property of ndodge3

• 27.2 Avg MPG

• GMC Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 160 Fuel-ups

  Property of Murph713

• 15.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 188 Fuel-ups

  Property of jwarner77

• 24.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 116 Fuel-ups

  Property of mastrodan3rd

• 17.5 Avg MPG

• GMC Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 58 Fuel-ups

  Property of gtanner

• 27.2 Avg MPG

• Caroline

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 43 Fuel-ups

  Property of Ryharris

• 21.9 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 62 Fuel-ups

  Property of jameshawco

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 68 Fuel-ups

  Property of Erikm1982

• 21.7 Avg MPG

• Max

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2024 • 5 Fuel-ups

  Property of jluyk

• 27.2 Avg MPG

• 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

• Big Blue

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 84 Fuel-ups

  Property of jstokes3

• 18.8 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

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 102 Fuel-ups

  Property of DCsells

• 14.1 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

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 252 Fuel-ups

  Property of ryank880

• 21.5 Avg MPG

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