Based on data from 220 vehicles, 12,765 fuel-ups and 4,841,994 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.35 with a 0.10 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (147) 5.3L V8 GAS (37) 6.2L V8 GAS (25) Any Body Style Extended Cab Pickup (4) Crew Cab Pickup (53) Cab & Chassis - Crew Cab (3) Any Submodel SLE (8) SLT (34) Denali (39) Elevation (51) AT4 (88)

Below you can see a distribution of the fuel-ups with 64 outliers (0.50%) removed.

Following shows the average MPG of each of the 220 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 96 Fuel-ups

  Property of sooner2016

• 25.3 Avg MPG

• My Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 105 Fuel-ups

  Property of sfwalters

• 18.8 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2023 • 18 Fuel-ups

  Property of rockopolster

• 18.1 Avg MPG

• 2021 Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 115 Fuel-ups

  Property of craigw76

• 18.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Oct 2023 • 6 Fuel-ups

  Property of jiro_franco

• 14.3 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Jan 2022 • 40 Fuel-ups

  Property of johnny91750

• 26.1 Avg MPG

• Sierra Duramax

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 25 Fuel-ups

  Property of BBJ1

• 21.9 Avg MPG

• 2021 GMC Sierra SLT 1500 4WD

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 6 Fuel-ups

  Property of blrains706

• 24.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 184 Fuel-ups

  Property of ryank880

• 21.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 77 Fuel-ups

  Property of wholyon

• 17.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 232 Fuel-ups

  Property of SilverSully83

• 24.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 158 Fuel-ups

  Property of AT4-GLI

• 23.4 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2022 • 37 Fuel-ups

  Property of milcher

• 21.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 154 Fuel-ups

  Property of Luddy

• 26.0 Avg MPG

• 21 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2021 • 63 Fuel-ups

  Property of bhess19

• 22.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 130 Fuel-ups

  Property of tgutwein

• 25.2 Avg MPG

• GMC Blackout

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 98 Fuel-ups

  Property of brockon

• 20.7 Avg MPG

• GMC Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 32 Fuel-ups

  Property of gtanner

• 27.2 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 135 Fuel-ups

  Property of tank91w

• 15.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 94 Fuel-ups

  Property of jmartinezflyer

• 16.0 Avg MPG

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