Based on data from 258 vehicles, 18,960 fuel-ups and 7,241,750 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 (164) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (29) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (65) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (43) Elevation (62) AT4 (104)

Below you can see a distribution of the fuel-ups with 98 outliers (0.51%) removed.

Following shows the average MPG of each of the 258 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 65 Fuel-ups

  Property of cbroberts88

• 17.9 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 139 Fuel-ups

  Property of stagrlee

• 18.6 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 57 Fuel-ups

  Property of Roy2Chin

• 18.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed
  Added Jun 2022 • 131 Fuel-ups

  Property of jctoss32986

• 14.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Apr 2023 • 55 Fuel-ups

  Property of govols13

• 22.1 Avg MPG

• Sierra

  2021 GMC Sierra 1500 4.3L V6 GAS Automatic 6 Speed
  Added Dec 2024 • 7 Fuel-ups

  Property of michael2660

• 13.2 Avg MPG

• Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2024 • 8 Fuel-ups

  Property of rendrog

• 22.1 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 42 Fuel-ups

  Property of deweyh

• 22.5 Avg MPG

• 2021 GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 99 Fuel-ups

  Property of GlenatTBP

• 23.4 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 82 Fuel-ups

  Property of zlaupp

• 16.5 Avg MPG

• GMC Sierra

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

  Property of AFowler

• 24.3 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 207 Fuel-ups

  Property of JasperAutos

• 21.2 Avg MPG

• Big White Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 70 Fuel-ups

  Property of eckseleven

• 19.6 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 54 Fuel-ups

  Property of burkian

• 25.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 86 Fuel-ups

  Property of crowan43

• 21.4 Avg MPG

• My Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 156 Fuel-ups

  Property of sfwalters

• 18.7 Avg MPG

• Elevation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2022 • 59 Fuel-ups

  Property of hollywood703

• 22.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 135 Fuel-ups

  Property of knooski

• 22.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2023 • 31 Fuel-ups

  Property of aximiliei

• 19.2 Avg MPG

• Grey Ghost

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2021 • 145 Fuel-ups

  Property of Britbeamer

• 19.5 Avg MPG

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