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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• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 67 Fuel-ups

  Property of AFowler

• 24.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 14 Fuel-ups

  Property of Ffterman

• 19.0 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 140 Fuel-ups

  Property of wingaterk

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2024 • 3 Fuel-ups

  Property of caf2412

• 19.8 Avg MPG

• Big White Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 66 Fuel-ups

  Property of eckseleven

• 19.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 46 Fuel-ups

  Property of mnm6080

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2023 • 35 Fuel-ups

  Property of sharkyp14

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 54 Fuel-ups

  Property of cbroberts88

• 18.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2023 • 27 Fuel-ups

  Property of aximiliei

• 18.9 Avg MPG

• Sierra 1500 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 160 Fuel-ups

  Property of jdrockin

• 24.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 66 Fuel-ups

  Property of dudecker

• 25.9 Avg MPG

• Big Red

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 115 Fuel-ups

  Property of 53Stang

• 24.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 93 Fuel-ups

  Property of Istijour

• 24.0 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 124 Fuel-ups

  Property of yogi-bear

• 17.2 Avg MPG

• 2021 GMC Sierra Diesel

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 93 Fuel-ups

  Property of dsc0814

• 23.3 Avg MPG

• His Sierra 1500 AT4 Farm Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 97 Fuel-ups

  Property of davisfarm86

• 18.9 Avg MPG

• GMC Blackout

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

  Property of brockon

• 20.6 Avg MPG

• 2021 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 51 Fuel-ups

  Property of rvckstar

• 22.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 67 Fuel-ups

  Property of jcg2009

• 22.1 Avg MPG

• 2021 Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 162 Fuel-ups

  Property of craigw76

• 18.6 Avg MPG

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