Based on data from 240 vehicles, 15,351 fuel-ups and 5,848,251 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.30 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 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 235 Fuel-ups

  Property of Silverflash22

• 22.5 Avg MPG

• Stormtrooper AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 22 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 Jul 2021 • 191 Fuel-ups

  Property of 3xjlerma

• 18.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 177 Fuel-ups

  Property of MoeD

• 24.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 56 Fuel-ups

  Property of steamroller69633

• 15.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2023 • 67 Fuel-ups

  Property of gdmannjr

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 116 Fuel-ups

  Property of TnTiger

• 23.1 Avg MPG

• Big Red

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2024 • 5 Fuel-ups

  Property of ccolella

• 15.5 Avg MPG

• GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 130 Fuel-ups

  Property of Slugster

• 24.0 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 157 Fuel-ups

  Property of tank91w

• 15.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 110 Fuel-ups

  Property of sooner2016

• 25.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 39 Fuel-ups

  Property of efsimm01

• 17.9 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 178 Fuel-ups

  Property of MWC_64

• 23.2 Avg MPG

• CarbonPro GMC

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 88 Fuel-ups

  Property of sefowler

• 24.5 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 305 Fuel-ups

  Property of jbab2004

• 19.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 225 Fuel-ups

  Property of ryank880

• 21.4 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 204 Fuel-ups

  Property of ahartman

• 16.5 Avg MPG

• 2021 GMC Sierra Diesel

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 78 Fuel-ups

  Property of dsc0814

• 22.9 Avg MPG

• Big Blue

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 69 Fuel-ups

  Property of jstokes3

• 18.7 Avg MPG

• My Sierra 1500

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

  Property of jcg2009

• 22.0 Avg MPG

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