Based on data from 249 vehicles, 17,722 fuel-ups and 6,760,235 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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• Grey Ghost

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2021 • 138 Fuel-ups

  Property of Britbeamer

• 19.6 Avg MPG

• Sierra 1500 Elavation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 71 Fuel-ups

  Property of lj1064

• 25.5 Avg MPG

• Big Papa

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2024 • 16 Fuel-ups

  Property of jtdupuis

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 186 Fuel-ups

  Property of yesubyllib

• 23.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 155 Fuel-ups

  Property of crs5011

• 24.7 Avg MPG

• My Sierra 1500

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

  Property of CJ_KC

• 25.0 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 137 Fuel-ups

  Property of stagrlee

• 18.6 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 198 Fuel-ups

  Property of MWC_64

• 23.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 45 Fuel-ups

  Property of MysticMissile4

• 17.3 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 363 Fuel-ups

  Property of jbab2004

• 19.5 Avg MPG

• 2021 GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 94 Fuel-ups

  Property of GlenatTBP

• 23.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 63 Fuel-ups

  Property of snoogans7031

• 17.3 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 238 Fuel-ups

  Property of ahartman

• 16.6 Avg MPG

• GMC AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 149 Fuel-ups

  Property of GMCAT4

• 22.5 Avg MPG

• 21Elevation-X31

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 41 Fuel-ups

  Property of csfx8588

• 18.6 Avg MPG

• Sierra

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

  Property of whippo3

• 23.5 Avg MPG

• Lucille

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 45 Fuel-ups

  Property of kwhight

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 13 Fuel-ups

  Property of jacobgoff

• 17.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 157 Fuel-ups

  Property of flodin30

• 24.1 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2022 • 99 Fuel-ups

  Property of milcher

• 21.2 Avg MPG

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