Based on data from 249 vehicles, 17,757 fuel-ups and 6,773,179 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 (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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• 2021 GMC

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2023 • 32 Fuel-ups

  Property of JayG60

• 21.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2020 • 124 Fuel-ups

  Property of jleehop

• 25.2 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2021 • 41 Fuel-ups

  Property of dismonio

• 24.0 Avg MPG

• GMC

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jul 2021 • 108 Fuel-ups

  Property of edwin191

• 18.5 Avg MPG

• MyGMCDiesel

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Feb 2021 • 153 Fuel-ups

  Property of IndyLM2GMC

• 23.9 Avg MPG

• Maverick

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 140 Fuel-ups

  Property of mvprealestate

• 15.6 Avg MPG

• Ray’s Truck

  2021 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2023 • 8 Fuel-ups

  Property of Wrongway88

• 13.5 Avg MPG

• GMC Sierra 1500 Elevation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 35 Fuel-ups

  Property of amtrak8

• 24.5 Avg MPG

• Presious

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 92 Fuel-ups

  Property of njaybong

• 24.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 84 Fuel-ups

  Property of joh02051

• 19.3 Avg MPG

• Sierra

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2023 • 11 Fuel-ups

  Property of shiftracer247

• 19.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 63 Fuel-ups

  Property of titan1727

• 17.6 Avg MPG

• A19639 2021 Black Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Mar 2023 • 17 Fuel-ups

  Property of Robbo1968

• 6.5 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 52 Fuel-ups

  Property of jbainton

• 24.2 Avg MPG

• Old

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2021 • 123 Fuel-ups

  Property of cdean72

• 14.2 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2020 • 84 Fuel-ups

  Property of wildman22john

• 15.6 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 70 Fuel-ups

  Property of bennybeat

• 17.0 Avg MPG

• Blue

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2022 • 32 Fuel-ups

  Property of gregair310

• 24.5 Avg MPG

• My Sierra 1500 AT4

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

  Property of robtwillis

• 18.3 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2021 • 127 Fuel-ups

  Property of avaag

• 15.9 Avg MPG

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