Based on data from 45 vehicles, 2,883 fuel-ups and 1,064,413 miles of driving, the 2020 GMC Sierra 2500 HD gets a combined Avg MPG of 14.31 with a 0.13 MPG margin of error.

Any Engine Type 6.6L V8 DIESEL (39) 6.6L V8 GAS (6) Any Body Style Extended Cab Pickup (1) Crew Cab Pickup (10) Any Submodel SLE (3) SLT (6) AT4 (14) Denali (22)

Below you can see a distribution of the fuel-ups with 26 outliers (0.89%) removed.

Following shows the average MPG of each of the 45 vehicles in the system.

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• Neil GMC 2500HD

  2020 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2020 • 225 Fuel-ups

  Property of neilalvares

• 13.5 Avg MPG

• Granite AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2020 • 160 Fuel-ups

  Property of NHATC

• 11.2 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 6 Speed
  Added Mar 2022 • 141 Fuel-ups

  Property of hoodsh

• 14.2 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2022 • 57 Fuel-ups

  Property of jeepin13

• 14.6 Avg MPG

• Sierra 2500 HD

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Feb 2024 • 12 Fuel-ups

  Property of tdbreeding

• 12.6 Avg MPG

• Pimpin AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2023 • 14 Fuel-ups

  Property of cdizzle

• 13.5 Avg MPG

• 2020 Dmax

  2020 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2024 • 4 Fuel-ups

  Property of Bigboydmax

• 13.8 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2023 • 27 Fuel-ups

  Property of rlsudlow

• 14.5 Avg MPG

• COVID Cruiser

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 208 Fuel-ups

  Property of jambiefsj

• 16.8 Avg MPG

• Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 73 Fuel-ups

  Property of bto71

• 14.3 Avg MPG

• Gallo Negro

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added May 2022 • 19 Fuel-ups

  Property of doakman1

• 10.1 Avg MPG

• AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jul 2022 • 87 Fuel-ups

  Property of Dziuky

• 17.0 Avg MPG

• 2020 Denali 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2020 • 133 Fuel-ups

  Property of maaiman

• 16.0 Avg MPG

• GMC AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2022 • 69 Fuel-ups

  Property of furlofoder

• 13.5 Avg MPG

• No Greater Love

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Nov 2021 • 15 Fuel-ups

  Property of mattjames11

• 11.7 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 • 253 Fuel-ups

  Property of mnoland2000

• 13.0 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

• Duramax

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added May 2021 • 97 Fuel-ups

  Property of Silentfun65

• 14.5 Avg MPG

• ‘Nali

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jul 2023 • 39 Fuel-ups

  Property of raulserrano

• 17.8 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

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