Based on data from 265 vehicles, 19,636 fuel-ups and 7,501,485 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.32 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (170) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (30) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (69) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (47) Elevation (63) AT4 (106)

Below you can see a distribution of the fuel-ups with 104 outliers (0.53%) removed.

Following shows the average MPG of each of the 265 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 69 Fuel-ups

  Property of MLTGMC

• 27.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 133 Fuel-ups

  Property of mastrodan3rd

• 17.5 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 • 104 Fuel-ups

  Property of GlenatTBP

• 23.3 Avg MPG

• My Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 158 Fuel-ups

  Property of sfwalters

• 18.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 195 Fuel-ups

  Property of jwarner77

• 24.0 Avg MPG

• Brown D

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 127 Fuel-ups

  Property of sc402443

• 24.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 57 Fuel-ups

  Property of MysticMissile4

• 17.0 Avg MPG

• GMC AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 166 Fuel-ups

  Property of GMCAT4

• 22.4 Avg MPG

• His Sierra 1500 AT4 Farm Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 108 Fuel-ups

  Property of davisfarm86

• 18.8 Avg MPG

• Work Truck

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 14 Fuel-ups

  Property of Welchb85

• 14.2 Avg MPG

• Sierra Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added May 2022 • 31 Fuel-ups

  Property of bdoooh

• 15.9 Avg MPG

• Big Blue

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 88 Fuel-ups

  Property of jstokes3

• 18.8 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 215 Fuel-ups

  Property of tank91w

• 15.6 Avg MPG

• Sierra AT4

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

  Property of rendrog

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 73 Fuel-ups

  Property of AndyLarkins

• 26.2 Avg MPG

• Mini-Max

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 14 Fuel-ups

  Property of chillman1971

• 23.0 Avg MPG

• Sierra

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2023 • 50 Fuel-ups

  Property of alex10haken

• 21.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 176 Fuel-ups

  Property of flodin30

• 24.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2024 • 15 Fuel-ups

  Property of jstarcher

• 12.9 Avg MPG

• Mac

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2025 • 5 Fuel-ups

  Property of Triwing

• 23.3 Avg MPG

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