Based on data from 265 vehicles, 19,569 fuel-ups and 7,476,311 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.32 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (170) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (30) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (69) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (47) Elevation (63) AT4 (106)

Below you can see a distribution of the fuel-ups with 104 outliers (0.53%) removed.

Following shows the average MPG of each of the 265 vehicles in the system.

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• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 60 Fuel-ups

  Property of Roy2Chin

• 18.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 80 Fuel-ups

  Property of steamroller69633

• 15.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 199 Fuel-ups

  Property of yesubyllib

• 23.2 Avg MPG

• Sierra

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

  Property of Adam2kSS

• 21.9 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Jan 2022 • 66 Fuel-ups

  Property of johnny91750

• 25.6 Avg MPG

• Big White Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 72 Fuel-ups

  Property of eckseleven

• 19.6 Avg MPG

• Clay 2021 Sierra 1500

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

  Property of chriii

• 13.5 Avg MPG

• Family Hauler

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 94 Fuel-ups

  Property of 2013RAM2500

• 23.4 Avg MPG

• QuilTruck

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 5 Fuel-ups

  Property of QuilXT

• 25.4 Avg MPG

• Brown D

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 126 Fuel-ups

  Property of sc402443

• 24.3 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 58 Fuel-ups

  Property of burkian

• 25.4 Avg MPG

• 2021 GMC Sierra Diesel

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

  Property of dsc0814

• 23.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 66 Fuel-ups

  Property of cbroberts88

• 17.9 Avg MPG

• 2021 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 52 Fuel-ups

  Property of rvckstar

• 22.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 8 Speed
  Added Apr 2023 • 56 Fuel-ups

  Property of govols13

• 22.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jul 2024 • 283 Fuel-ups

  Property of Rockn

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 60 Fuel-ups

  Property of jps4di

• 23.8 Avg MPG

• '21 White AT4 DuraMax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 177 Fuel-ups

  Property of APokowski

• 20.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2024 • 27 Fuel-ups

  Property of kdillon00

• 23.0 Avg MPG

• Lil White

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2024 • 38 Fuel-ups

  Property of zogeil

• 19.8 Avg MPG

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