Based on data from 37 vehicles, 2,050 fuel-ups and 734,492 miles of driving, the 2020 GMC Sierra 3500 HD gets a combined Avg MPG of 13.27 with a 0.16 MPG margin of error.

Any Engine Type 6.6L V8 DIESEL (35) 6.6L V8 GAS (1) Any Body Style Crew Cab Pickup (4) Any Submodel Base (1) SLT (5) AT4 (5) Denali (26)

Below you can see a distribution of the fuel-ups with 45 outliers (2.15%) removed.

Following shows the average MPG of each of the 37 vehicles in the system.

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• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2022 • 26 Fuel-ups

  Property of s10stylez

• 15.2 Avg MPG

• My Denali 3500HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2021 • 43 Fuel-ups

  Property of williamsm5813

• 13.6 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jan 2022 • 66 Fuel-ups

  Property of Grunnsetning

• 13.6 Avg MPG

• Big Booty L5P

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added May 2021 • 26 Fuel-ups

  Property of Bigbooty

• 10.8 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 29 Fuel-ups

  Property of Blueyfella

• 15.1 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Sep 2020 • 24 Fuel-ups

  Property of Camstyn

• 14.7 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added May 2020 • 6 Fuel-ups

  Property of wedgie321

• 10.7 Avg MPG

• Sierra 3500 Denali HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Dec 2020 • 81 Fuel-ups

  Property of voylesjake

• 15.3 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jan 2020 • 59 Fuel-ups

  Property of spence8870

• 15.9 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2021 • 24 Fuel-ups

  Property of chris129

• 14.7 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2021 • 3 Fuel-ups

  Property of trubluluder93

• 8.3 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2021 • 5 Fuel-ups

  Property of saulG96

• 13.4 Avg MPG

• Becca

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jan 2020 • 6 Fuel-ups

  Property of Gunslinger4

• 16.5 Avg MPG

• AT 4 3500 HD

  2020 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Sep 2020 • 16 Fuel-ups

  Property of Jeferon1

• 12.1 Avg MPG

• My Sierra 3500 HD

  2020 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Nov 2020 • 9 Fuel-ups

  Property of aricb23

• 13.7 Avg MPG

• 3500

  2020 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Nov 2019 • 38 Fuel-ups

  Property of rufus28

• 18.2 Avg MPG

• The PEARL

  2020 GMC Sierra 3500 HD Denali
  Added Aug 2019 • 28 Fuel-ups

  Property of bnoot

• 15.0 Avg MPG

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