Based on data from 193 vehicles, 8,083 fuel-ups and 3,034,945 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.22 with a 0.13 MPG margin of error.

Any Engine Type 2.7L L4 GAS (7) 3.0L L6 DIESEL (128) 5.3L V8 GAS (33) 6.2L V8 GAS (25) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (51) Cab & Chassis - Crew Cab (3) Any Submodel SLE (7) SLT (28) Denali (32) Elevation (44) AT4 (82)

Below you can see a distribution of the fuel-ups with 28 outliers (0.35%) removed.

Following shows the average MPG of each of the 193 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 • 58 Fuel-ups

  Property of tripleplay18

• 25.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 56 Fuel-ups

  Property of MoeD

• 24.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed
  Added May 2021 • 95 Fuel-ups

  Property of bhbdvm

• 16.0 Avg MPG

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 47 Fuel-ups

  Property of DCsells

• 13.5 Avg MPG

• Clay 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2021 • 40 Fuel-ups

  Property of chriii

• 13.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 92 Fuel-ups

  Property of yesubyllib

• 22.6 Avg MPG

• 2021 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 28 Fuel-ups

  Property of rvckstar

• 22.1 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 107 Fuel-ups

  Property of MWC_64

• 23.7 Avg MPG

• GMC Blackout

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 56 Fuel-ups

  Property of brockon

• 20.5 Avg MPG

• Work Black AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 127 Fuel-ups

  Property of ChasN5ZXN

• 22.4 Avg MPG

• Grey Ghost

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2021 • 67 Fuel-ups

  Property of Britbeamer

• 19.5 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 106 Fuel-ups

  Property of JasperAutos

• 21.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2022 • 25 Fuel-ups

  Property of SeanLewis10

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2021 • 105 Fuel-ups

  Property of cdean72

• 14.0 Avg MPG

• Maverick

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 96 Fuel-ups

  Property of mvprealestate

• 15.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 92 Fuel-ups

  Property of tgutwein

• 24.9 Avg MPG

• GMC AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 65 Fuel-ups

  Property of GMCAT4

• 23.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 158 Fuel-ups

  Property of SilverSully83

• 25.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 33 Fuel-ups

  Property of crowan43

• 22.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 103 Fuel-ups

  Property of ryank880

• 21.3 Avg MPG

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