Based on data from 44 vehicles, 2,825 fuel-ups and 1,043,830 miles of driving, the 2020 GMC Sierra 2500 HD gets a combined Avg MPG of 14.32 with a 0.13 MPG margin of error.

Any Engine Type 6.6L V8 DIESEL (38) 6.6L V8 GAS (6) Any Body Style Extended Cab Pickup (1) Crew Cab Pickup (9) Any Submodel SLE (3) SLT (5) AT4 (14) Denali (22)

Below you can see a distribution of the fuel-ups with 26 outliers (0.91%) removed.

Following shows the average MPG of each of the 44 vehicles in the system.

• «
• 1
• 2
• 3
• »

• Sierra 2500 HD

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Feb 2024 • 10 Fuel-ups

  Property of tdbreeding

• 12.6 Avg MPG

• Granite AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2020 • 155 Fuel-ups

  Property of NHATC

• 11.2 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2022 • 54 Fuel-ups

  Property of jeepin13

• 14.5 Avg MPG

• 2020 Denali 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2020 • 131 Fuel-ups

  Property of maaiman

• 15.9 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2023 • 24 Fuel-ups

  Property of rlsudlow

• 14.2 Avg MPG

• GMC AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2022 • 62 Fuel-ups

  Property of furlofoder

• 13.8 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 6 Speed
  Added Mar 2022 • 135 Fuel-ups

  Property of hoodsh

• 14.2 Avg MPG

• COVID Cruiser

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 204 Fuel-ups

  Property of jambiefsj

• 16.9 Avg MPG

• Pimpin AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2023 • 11 Fuel-ups

  Property of cdizzle

• 13.1 Avg MPG

• 2020 Sierra 2500 Duramax

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2019 • 251 Fuel-ups

  Property of mnoland2000

• 13.0 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jan 2020 • 100 Fuel-ups

  Property of zardoz5

• 14.6 Avg MPG

• AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jul 2022 • 80 Fuel-ups

  Property of Dziuky

• 16.9 Avg MPG

• ‘Nali

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jul 2023 • 38 Fuel-ups

  Property of raulserrano

• 17.8 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Sep 2020 • 146 Fuel-ups

  Property of Xaositek

• 16.1 Avg MPG

• My Denali 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Dec 2022 • 8 Fuel-ups

  Property of fasdon

• 10.8 Avg MPG

• L5P

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Apr 2021 • 49 Fuel-ups

  Property of jwmontoya

• 14.2 Avg MPG

• No Greater Love

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Nov 2021 • 14 Fuel-ups

  Property of mattjames11

• 11.7 Avg MPG

• Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 70 Fuel-ups

  Property of bto71

• 14.3 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 6 Speed
  Added May 2020 • 68 Fuel-ups

  Property of uncledot

• 13.3 Avg MPG

• Gallo Negro

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added May 2022 • 18 Fuel-ups

  Property of doakman1

• 10.1 Avg MPG

• «
• 1
• 2
• 3
• »