Based on data from 240 vehicles, 15,320 fuel-ups and 5,836,989 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 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 63 Fuel-ups

  Property of titan1727

• 17.6 Avg MPG

• A19639 2021 Black Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Mar 2023 • 17 Fuel-ups

  Property of Robbo1968

• 6.5 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 52 Fuel-ups

  Property of jbainton

• 24.2 Avg MPG

• Old

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2021 • 123 Fuel-ups

  Property of cdean72

• 14.2 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2020 • 84 Fuel-ups

  Property of wildman22john

• 15.6 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 70 Fuel-ups

  Property of bennybeat

• 17.0 Avg MPG

• Blue

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2022 • 32 Fuel-ups

  Property of gregair310

• 24.5 Avg MPG

• My Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 50 Fuel-ups

  Property of robtwillis

• 18.3 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2021 • 127 Fuel-ups

  Property of avaag

• 15.9 Avg MPG

• Sierra SLT

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Aug 2021 • 34 Fuel-ups

  Property of Toolmandbq

• 14.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 50 Fuel-ups

  Property of fuzz26

• 19.9 Avg MPG

• Rudy

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 60 Fuel-ups

  Property of jacyna

• 18.4 Avg MPG

• GMC A19636 01 2023

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Jan 2023 • 24 Fuel-ups

  Property of Robbo1968

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2021 • 207 Fuel-ups

  Property of jblomseth

• 17.1 Avg MPG

• 2021 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 29 Fuel-ups

  Property of elowx

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2022 • 22 Fuel-ups

  Property of Rackumrack

• 15.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 7 Fuel-ups

  Property of jayp61

• 26.1 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 36 Fuel-ups

  Property of creso

• 19.2 Avg MPG

• 2021 GMC Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 96 Fuel-ups

  Property of rotorslap

• 20.7 Avg MPG

• GMC Sierra 1500 Duramax

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2021 • 54 Fuel-ups

  Property of jshodges-tx

• 21.2 Avg MPG

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