Based on data from 240 vehicles, 15,218 fuel-ups and 5,798,374 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 (0.56%) removed.

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

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• GMC

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Dec 2021 • 99 Fuel-ups

  Property of msgraves33

• 19.4 Avg MPG

• 2021 White Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Dec 2022 • 9 Fuel-ups

  Property of Robbo1968

• 16.8 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added May 2021 • 53 Fuel-ups

  Property of Mikecompton

• 15.7 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2022 • 34 Fuel-ups

  Property of SeanLewis10

• 15.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2022 • 20 Fuel-ups

  Property of Camstyn

• 27.4 Avg MPG

• 2021 GMC Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2022 • 27 Fuel-ups

  Property of abose

• 26.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed
  Added May 2021 • 98 Fuel-ups

  Property of bhbdvm

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 48 Fuel-ups

  Property of scubaking69

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2021 • 21 Fuel-ups

  Property of pgsports

• 13.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2022 • 29 Fuel-ups

  Property of jmdunleavy

• 16.2 Avg MPG

• 21 GMC Elevation 3.0 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 133 Fuel-ups

  Property of jkluge

• 24.6 Avg MPG

• Sasquatch Hunter

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 47 Fuel-ups

  Property of Aldrummond

• 20.5 Avg MPG

• Denali green

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 21 Fuel-ups

  Property of travelingman1

• 22.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 41 Fuel-ups

  Property of us244938

• 24.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 44 Fuel-ups

  Property of Frayed_Ends

• 22.0 Avg MPG

• GMC Black 11 2021

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Nov 2021 • 64 Fuel-ups

  Property of Robbo1968

• 17.5 Avg MPG

• 21 Sierra 1500

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

  Property of thekevin

• 25.0 Avg MPG

• MiniMax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 67 Fuel-ups

  Property of cjel23

• 24.3 Avg MPG

• Mighty Max

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Oct 2020 • 35 Fuel-ups

  Property of Bubbalove66

• 23.5 Avg MPG

• My Sierra AT4 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 98 Fuel-ups

  Property of mich1989

• 15.6 Avg MPG

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