Based on data from 249 vehicles, 17,722 fuel-ups and 6,760,235 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.33 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (160) 5.3L V8 GAS (50) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (62) Cab & Chassis - Crew Cab (3) Any Submodel SLE (10) SLT (37) Denali (42) Elevation (60) AT4 (100)

Below you can see a distribution of the fuel-ups with 92 outliers (0.52%) removed.

Following shows the average MPG of each of the 249 vehicles in the system.

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• 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

• 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

• Sierra 1500

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

  Property of Mason20

• 25.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 99 Fuel-ups

  Property of John30563

• 24.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 13 Fuel-ups

  Property of jesseallenpatterson

• 22.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2022 • 4 Fuel-ups

  Property of Seakuv

• 32.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2022 • 7 Fuel-ups

  Property of JohnPro

• 26.3 Avg MPG

• Family Truckster

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 8 Fuel-ups

  Property of Mtnbound

• 22.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 31 Fuel-ups

  Property of pluc_val

• 25.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 45 Fuel-ups

  Property of beech76

• 22.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 39 Fuel-ups

  Property of michaelm91

• 14.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 51 Fuel-ups

  Property of jsetti

• 23.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Mar 2021 • 35 Fuel-ups

  Property of RebelG

• 15.2 Avg MPG

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