Based on data from 151 vehicles, 3,292 fuel-ups and 1,240,720 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.14 with a 0.20 MPG margin of error.

Any Engine Type 2.7L L4 GAS (4) 3.0L L6 DIESEL (98) 5.3L V8 GAS (29) 6.2L V8 GAS (20) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (37) Cab & Chassis - Crew Cab (3) Any Submodel SLE (5) Denali (22) SLT (24) Elevation (30) AT4 (70)

Below you can see a distribution of the fuel-ups with 6 outliers (0.18%) removed.

Following shows the average MPG of each of the 151 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 20 Fuel-ups

  Property of tank91w

• 15.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 39 Fuel-ups

  Property of jwarner77

• 24.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 41 Fuel-ups

  Property of 3xjlerma

• 18.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Nov 2021 • 8 Fuel-ups

  Property of Robbo1968

• 17.3 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 31 Fuel-ups

  Property of jbab2004

• 18.8 Avg MPG

• 2021 GMC

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

  Property of creso

• 21.6 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 50 Fuel-ups

  Property of rdurbin

• 15.4 Avg MPG

• Clay 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2021 • 23 Fuel-ups

  Property of chriii

• 14.7 Avg MPG

• Brown D

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 16 Fuel-ups

  Property of sc402443

• 23.8 Avg MPG

• My Sierra 1500

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

  Property of CJ_KC

• 25.7 Avg MPG

• Big White Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 18 Fuel-ups

  Property of eckseleven

• 18.6 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2020 • 37 Fuel-ups

  Property of bennybeat

• 17.3 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 52 Fuel-ups

  Property of JasperAutos

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 49 Fuel-ups

  Property of jtowns

• 16.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 7 Fuel-ups

  Property of johnoutdoors

• 21.7 Avg MPG

• 2021 Sierra Diesel

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Cab & Chassis - Crew Cab
  Added Oct 2021 • 9 Fuel-ups

  Property of Mooseman2

• 23.2 Avg MPG

• My Sierra 1500

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

  Property of tgutwein

• 25.1 Avg MPG

• My Sierra AT4 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 46 Fuel-ups

  Property of mich1989

• 16.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 35 Fuel-ups

  Property of Nefariouss

• 20.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 29 Fuel-ups

  Property of crs5011

• 25.9 Avg MPG

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