Based on data from 251 vehicles, 18,089 fuel-ups and 6,920,162 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.39 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 (51) 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 (101)

Below you can see a distribution of the fuel-ups with 93 outliers (0.51%) removed.

Following shows the average MPG of each of the 251 vehicles in the system.

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• CarbonPro Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 96 Fuel-ups

  Property of tripleplay18

• 25.5 Avg MPG

• Clifford

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 56 Fuel-ups

  Property of slowhercules

• 20.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2022 • 85 Fuel-ups

  Property of Texasoffshore

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 257 Fuel-ups

  Property of SilverSully83

• 24.2 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2024 • 49 Fuel-ups

  Property of banditz

• 20.8 Avg MPG

• '21 White AT4 DuraMax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 132 Fuel-ups

  Property of APokowski

• 20.6 Avg MPG

• Dangmc

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

  Property of Dangmc

• 23.0 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 171 Fuel-ups

  Property of rdurbin

• 15.5 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 149 Fuel-ups

  Property of Bost05

• 14.5 Avg MPG

• GMC Sierra 1500

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

  Property of firemech

• 35.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 62 Fuel-ups

  Property of dphi201

• 23.4 Avg MPG

• Bigfoot

  2021 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 75 Fuel-ups

  Property of White-Denali

• 16.0 Avg MPG

• My 2021 Sierra 1500

  2021 GMC Sierra 1500 Denali 3,0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 12 Fuel-ups

  Property of shadow_za

• 23.4 Avg MPG

• 3.0 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Sep 2021 • 59 Fuel-ups

  Property of Timmy59360

• 22.9 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2022 • 72 Fuel-ups

  Property of jc9995

• 25.5 Avg MPG

• 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

• 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

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