Based on data from 192 vehicles, 15,614 fuel-ups and 5,146,558 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.22 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (85) 4.3L V6 GAS (1) 5.3L V8 GAS (52) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (46) Any Submodel Base (3) SLE (10) Elevation (26) Denali (38) SLT (45) AT4 (70)

Below you can see a distribution of the fuel-ups with 350 outliers (2.19%) removed.

Following shows the average MPG of each of the 192 vehicles in the system.

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• Truck

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 23 Fuel-ups

  Property of texadian

• 20.8 Avg MPG

• 2020 GMC

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Oct 2020 • 21 Fuel-ups

  Property of Brame

• 19.5 Avg MPG

• Sierra 1500 4x4

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2020 • 44 Fuel-ups

  Property of Cman175

• 24.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2020 • 25 Fuel-ups

  Property of chebick

• 24.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2020 • 56 Fuel-ups

  Property of Buellx72

• 18.2 Avg MPG

• Mike’s 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2020 • 43 Fuel-ups

  Property of Mikecompton

• 15.6 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 21 Fuel-ups

  Property of yogi-bear

• 16.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 11 Fuel-ups

  Property of martinweber

• 22.8 Avg MPG

• Dark Knight

  2020 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 71 Fuel-ups

  Property of RedWonder

• 17.1 Avg MPG

• AT4 Duramax On 35s

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2020 • 71 Fuel-ups

  Property of Lerew

• 20.7 Avg MPG

• 2020 AT4 Sierra 1500

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

  Property of Miket54

• 16.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Jan 2021 • 6 Fuel-ups

  Property of HDP_14

• 16.4 Avg MPG

• “Zoee” Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2020 • 34 Fuel-ups

  Property of plettfam

• 13.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 4 Fuel-ups

  Property of willsep3241

• 27.4 Avg MPG

• Denali

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2020 • 51 Fuel-ups

  Property of hhernandez828

• 26.2 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2020 • 45 Fuel-ups

  Property of mrm1776

• 17.6 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Dec 2020 • 3 Fuel-ups

  Property of bradyt

• 11.7 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2020 • 4 Fuel-ups

  Property of omtz165

• 16.3 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 6 Fuel-ups

  Property of Jalal_Jalal

• 22.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 6 Fuel-ups

  Property of unluckycharm

• 16.5 Avg MPG

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