Based on data from 240 vehicles, 15,358 fuel-ups and 5,851,337 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.30 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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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 69 Fuel-ups

  Property of Danm1228

• 15.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 7 Fuel-ups

  Property of dshipman

• 20.8 Avg MPG

• Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Cab & Chassis - Crew Cab
  Added Jun 2021 • 18 Fuel-ups

  Property of Kylie1

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2021 • 18 Fuel-ups

  Property of Geoff90

• 17.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 22 Fuel-ups

  Property of chrisholly

• 22.1 Avg MPG

• Sierra 21 AT4 3.0

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 33 Fuel-ups

  Property of billneu08

• 22.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 6 Fuel-ups

  Property of QueueFue

• 23.9 Avg MPG

• Lemonade

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 12 Fuel-ups

  Property of mallman

• 20.6 Avg MPG

• Shadow

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 34 Fuel-ups

  Property of Coolaidman

• 17.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 12 Fuel-ups

  Property of tcochran

• 17.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 7 Fuel-ups

  Property of buehlein

• 26.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 24 Fuel-ups

  Property of Reaper_

• 15.7 Avg MPG

• AT4 Duramax

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

  Property of JDE

• 24.2 Avg MPG

• SLT Babymax

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2021 • 11 Fuel-ups

  Property of Fordt

• 23.4 Avg MPG

• YanivsAT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 12 Fuel-ups

  Property of YanivsAT4

• 21.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 9 Fuel-ups

  Property of halflife1820

• 21.5 Avg MPG

• 21 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2020 • 8 Fuel-ups

  Property of meema4780

• 20.8 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Cab & Chassis - Crew Cab
  Added Jan 2021 • 3 Fuel-ups

  Property of MrGold

• 27.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 4 Fuel-ups

  Property of Jrschrum

• 32.0 Avg MPG

• Hank

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 3 Fuel-ups

  Property of knowah

• 16.9 Avg MPG

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