Based on data from 211 vehicles, 11,273 fuel-ups and 4,247,934 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.27 with a 0.11 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (140) 5.3L V8 GAS (35) 6.2L V8 GAS (25) Any Body Style Extended Cab Pickup (4) Crew Cab Pickup (54) Cab & Chassis - Crew Cab (3) Any Submodel SLE (8) SLT (32) Denali (35) Elevation (50) AT4 (86)

Below you can see a distribution of the fuel-ups with 55 outliers (0.49%) removed.

Following shows the average MPG of each of the 211 vehicles in the system.

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• Presious

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 89 Fuel-ups

  Property of njaybong

• 24.9 Avg MPG

• A19639 2021 Black Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Mar 2023 • 16 Fuel-ups

  Property of Robbo1968

• 6.5 Avg MPG

• Maverick

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 131 Fuel-ups

  Property of mvprealestate

• 15.6 Avg MPG

• ‘21 GMC Sierra

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2023 • 28 Fuel-ups

  Property of BigL31

• 24.3 Avg MPG

• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 44 Fuel-ups

  Property of AFowler

• 24.1 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 136 Fuel-ups

  Property of JasperAutos

• 21.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 116 Fuel-ups

  Property of tank91w

• 15.6 Avg MPG

• Yodha

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Oct 2021 • 91 Fuel-ups

  Property of YODHA

• 22.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 131 Fuel-ups

  Property of Luddy

• 26.0 Avg MPG

• GMC

  2021 GMC Sierra 1500 SLT
  Added Jan 2023 • 23 Fuel-ups

  Property of builder604

• 16.1 Avg MPG

• CarbonPro Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 83 Fuel-ups

  Property of tripleplay18

• 25.5 Avg MPG

• Sierra 1500 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2022 • 76 Fuel-ups

  Property of jdrockin

• 24.5 Avg MPG

• Clay 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2021 • 60 Fuel-ups

  Property of chriii

• 13.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2023 • 5 Fuel-ups

  Property of sharkyp14

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2022 • 11 Fuel-ups

  Property of SoCalEco14

• 18.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 45 Fuel-ups

  Property of jps4di

• 23.4 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 191 Fuel-ups

  Property of jbab2004

• 19.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 83 Fuel-ups

  Property of 76109

• 18.9 Avg MPG

• 21 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2021 • 54 Fuel-ups

  Property of bhess19

• 22.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 72 Fuel-ups

  Property of TnTiger

• 23.4 Avg MPG

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