Based on data from 115 vehicles, 1,484 fuel-ups and 549,638 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 19.94 with a 0.29 MPG margin of error.

Any Engine Type 3.0L L6 DIESEL (79) 5.3L V8 GAS (22) 6.2L V8 GAS (14) Any Body Style Extended Cab Pickup (1) Crew Cab Pickup (28) Cab & Chassis - Crew Cab (2) Any Submodel SLE (3) SLT (18) Denali (18) Elevation (21) AT4 (55)

Below you can see a distribution of the fuel-ups with 2 outliers (0.13%) removed.

Following shows the average MPG of each of the 115 vehicles in the system.

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• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 26 Fuel-ups

  Property of MWC_64

• 23.4 Avg MPG

• My Sierra 1500

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

  Property of 3xjlerma

• 20.3 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2020 • 25 Fuel-ups

  Property of wildman22john

• 15.2 Avg MPG

• Blue Steel

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 4 Fuel-ups

  Property of njaybong

• 26.0 Avg MPG

• My Sierra 1500

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

  Property of Erikm1982

• 24.2 Avg MPG

• 21 Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 15 Fuel-ups

  Property of thekevin

• 25.0 Avg MPG

• My Sierra 1500

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

  Property of Reaper_

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 13 Fuel-ups

  Property of jtowns

• 15.8 Avg MPG

• GMC

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

  Property of edwin191

• 19.0 Avg MPG

• '21 White AT4 DuraMax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 19 Fuel-ups

  Property of APokowski

• 20.4 Avg MPG

• Sasha 2

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Apr 2021 • 19 Fuel-ups

  Property of fides893

• 15.5 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 36 Fuel-ups

  Property of rdurbin

• 15.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 29 Fuel-ups

  Property of rotorslap

• 21.9 Avg MPG

• His Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 13 Fuel-ups

  Property of davisfarm86

• 18.8 Avg MPG

• Grey Ghost

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2021 • 25 Fuel-ups

  Property of Britbeamer

• 19.1 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 5 Fuel-ups

  Property of Mason20

• 25.6 Avg MPG

• My Sierra 1500

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

  Property of John30563

• 24.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 23 Fuel-ups

  Property of bh1703

• 20.3 Avg MPG

• MiniMax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 30 Fuel-ups

  Property of cjel23

• 24.4 Avg MPG

• 2021 Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 7 Fuel-ups

  Property of craigw76

• 17.8 Avg MPG

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