Based on data from 250 vehicles, 17,774 fuel-ups and 6,779,535 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.33 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (160) 5.3L V8 GAS (51) 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 (61) AT4 (100)

Below you can see a distribution of the fuel-ups with 92 outliers (0.51%) removed.

Following shows the average MPG of each of the 250 vehicles in the system.

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• 21 Sierra

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 72 Fuel-ups

  Property of zlaupp

• 16.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 156 Fuel-ups

  Property of 76109

• 19.0 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 141 Fuel-ups

  Property of wingaterk

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 82 Fuel-ups

  Property of crowan43

• 21.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 226 Fuel-ups

  Property of AT4-GLI

• 23.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 73 Fuel-ups

  Property of steamroller69633

• 15.7 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 240 Fuel-ups

  Property of ahartman

• 16.6 Avg MPG

• Sasha 2

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Apr 2021 • 145 Fuel-ups

  Property of fides893

• 18.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2024 • 44 Fuel-ups

  Property of KGermany97

• 17.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 272 Fuel-ups

  Property of Silverflash22

• 22.5 Avg MPG

• GMC AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 150 Fuel-ups

  Property of GMCAT4

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Apr 2023 • 49 Fuel-ups

  Property of govols13

• 22.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2023 • 36 Fuel-ups

  Property of sharkyp14

• 16.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jul 2024 • 255 Fuel-ups

  Property of Rockn

• 16.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 119 Fuel-ups

  Property of travreed22

• 23.3 Avg MPG

• GMC Blackout

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 131 Fuel-ups

  Property of brockon

• 20.6 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2022 • 100 Fuel-ups

  Property of milcher

• 21.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 321 Fuel-ups

  Property of jtowns

• 17.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 64 Fuel-ups

  Property of snoogans7031

• 17.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 57 Fuel-ups

  Property of AndyLarkins

• 26.2 Avg MPG

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