Based on data from 240 vehicles, 15,296 fuel-ups and 5,828,332 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.31 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (157) 5.3L V8 GAS (45) 6.2L V8 GAS (27) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (59) Cab & Chassis - Crew Cab (3) Any Submodel SLE (9) SLT (35) Denali (43) Elevation (58) AT4 (95)

Below you can see a distribution of the fuel-ups with 85 outliers (0.55%) removed.

Following shows the average MPG of each of the 240 vehicles in the system.

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• Family Hauler

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 65 Fuel-ups

  Property of 2013RAM2500

• 23.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 270 Fuel-ups

  Property of jtowns

• 17.0 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 30 Fuel-ups

  Property of zlaupp

• 16.8 Avg MPG

• Sierra 1500 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 135 Fuel-ups

  Property of jdrockin

• 24.8 Avg MPG

• 21Elevation-X31

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 16 Fuel-ups

  Property of csfx8588

• 18.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 176 Fuel-ups

  Property of MoeD

• 24.3 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 109 Fuel-ups

  Property of wingaterk

• 17.9 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 128 Fuel-ups

  Property of stagrlee

• 18.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2024 • 19 Fuel-ups

  Property of BigBoostDSM

• 13.6 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 11 Fuel-ups

  Property of Roy2Chin

• 19.0 Avg MPG

• Stormtrooper AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 21 Fuel-ups

  Property of SoCalEco14

• 19.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 37 Fuel-ups

  Property of efsimm01

• 17.9 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 79 Fuel-ups

  Property of whippo3

• 23.5 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2023 • 54 Fuel-ups

  Property of rockopolster

• 16.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 110 Fuel-ups

  Property of Nefariouss

• 21.1 Avg MPG

• 2021 GMC Sierra Diesel

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

  Property of dsc0814

• 22.8 Avg MPG

• Big Red

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2024 • 4 Fuel-ups

  Property of ccolella

• 15.3 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 15 Fuel-ups

  Property of deweyh

• 25.2 Avg MPG

• My Sierra 1500

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

  Property of Luddy

• 26.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 99 Fuel-ups

  Property of travreed22

• 23.1 Avg MPG

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