Based on data from 241 vehicles, 15,484 fuel-ups and 5,901,670 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.31 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (158) 5.3L V8 GAS (45) 6.2L V8 GAS (27) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (60) Cab & Chassis - Crew Cab (3) Any Submodel SLE (9) SLT (36) Denali (43) Elevation (58) AT4 (95)

Below you can see a distribution of the fuel-ups with 86 outliers (0.55%) removed.

Following shows the average MPG of each of the 241 vehicles in the system.

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• Thot Yacht

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 73 Fuel-ups

  Property of TrevorBarrett

• 23.7 Avg MPG

• Sierra Duramax

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 26 Fuel-ups

  Property of BBJ1

• 22.2 Avg MPG

• Arnold

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 281 Fuel-ups

  Property of st333

• 14.7 Avg MPG

• My Sierra 1500

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

  Property of tgutwein

• 25.2 Avg MPG

• GMC AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 68 Fuel-ups

  Property of fuelburner

• 13.4 Avg MPG

• GMC TOWING

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2023 • 3 Fuel-ups

  Property of l1tech

• 13.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Oct 2023 • 8 Fuel-ups

  Property of jiro_franco

• 14.8 Avg MPG

• ‘21 GMC Sierra

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2023 • 51 Fuel-ups

  Property of BigL31

• 24.9 Avg MPG

• 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

• Old Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2022 • 23 Fuel-ups

  Property of SoCalEco14

• 18.3 Avg MPG

• Steve's Sierra

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Oct 2022 • 8 Fuel-ups

  Property of tosober

• 29.1 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

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