Based on data from 252 vehicles, 18,269 fuel-ups and 6,986,591 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.37 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (161) 5.3L V8 GAS (52) 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 (102)

Below you can see a distribution of the fuel-ups with 94 outliers (0.51%) removed.

Following shows the average MPG of each of the 252 vehicles in the system.

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• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 69 Fuel-ups

  Property of AFowler

• 24.3 Avg MPG

• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2024 • 27 Fuel-ups

  Property of steven289

• 26.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 277 Fuel-ups

  Property of Silverflash22

• 22.5 Avg MPG

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 104 Fuel-ups

  Property of DCsells

• 14.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 132 Fuel-ups

  Property of Nefariouss

• 21.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 245 Fuel-ups

  Property of Luddy

• 26.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 325 Fuel-ups

  Property of jtowns

• 17.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2024 • 18 Fuel-ups

  Property of kdillon00

• 23.1 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 202 Fuel-ups

  Property of JasperAutos

• 21.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 161 Fuel-ups

  Property of flodin30

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2023 • 39 Fuel-ups

  Property of sharkyp14

• 16.0 Avg MPG

• Big White Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 68 Fuel-ups

  Property of eckseleven

• 19.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 18 Fuel-ups

  Property of Ffterman

• 18.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 131 Fuel-ups

  Property of knooski

• 22.7 Avg MPG

• GMC AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 154 Fuel-ups

  Property of GMCAT4

• 22.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2024 • 4 Fuel-ups

  Property of Andrew03

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2024 • 14 Fuel-ups

  Property of caf2412

• 15.6 Avg MPG

• 21 Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 77 Fuel-ups

  Property of Corelax

• 22.2 Avg MPG

• Dirtymax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 112 Fuel-ups

  Property of Jackpot01

• 24.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2024 • 46 Fuel-ups

  Property of KGermany97

• 17.3 Avg MPG

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