Based on data from 42 vehicles, 2,489 fuel-ups and 916,784 miles of driving, the 2020 GMC Sierra 2500 HD gets a combined Avg MPG of 14.26 with a 0.14 MPG margin of error.

Any Engine Type 6.6L V8 DIESEL (36) 6.6L V8 GAS (6) Any Body Style Extended Cab Pickup (1) Crew Cab Pickup (9) Any Submodel SLE (3) SLT (5) AT4 (12) Denali (22)

Below you can see a distribution of the fuel-ups with 25 outliers (0.99%) removed.

Following shows the average MPG of each of the 42 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 • 203 Fuel-ups

  Property of neilalvares

• 13.6 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jan 2022 • 123 Fuel-ups

  Property of BPowAT4HD

• 16.5 Avg MPG

• Big Red II

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2020 • 150 Fuel-ups

  Property of TackleBox

• 13.6 Avg MPG

• COVID Cruiser

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 187 Fuel-ups

  Property of jambiefsj

• 17.0 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 6 Speed
  Added Mar 2022 • 105 Fuel-ups

  Property of hoodsh

• 14.3 Avg MPG

• Granite AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2020 • 128 Fuel-ups

  Property of NHATC

• 11.3 Avg MPG

• ‘Nali

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jul 2023 • 12 Fuel-ups

  Property of raulserrano

• 17.0 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2023 • 7 Fuel-ups

  Property of rlsudlow

• 12.9 Avg MPG

• AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jul 2022 • 61 Fuel-ups

  Property of Dziuky

• 17.1 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2021 • 102 Fuel-ups

  Property of DMaxTRR

• 15.9 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 • 219 Fuel-ups

  Property of mnoland2000

• 13.0 Avg MPG

• 2020 Denali 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2020 • 105 Fuel-ups

  Property of maaiman

• 16.1 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Jan 2020 • 89 Fuel-ups

  Property of zardoz5

• 14.4 Avg MPG

• BatMobile II

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 149 Fuel-ups

  Property of Rocinante1

• 16.1 Avg MPG

• Duramax

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added May 2021 • 86 Fuel-ups

  Property of Silentfun65

• 14.4 Avg MPG

• Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Mar 2020 • 60 Fuel-ups

  Property of bto71

• 14.0 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
  Added Aug 2022 • 42 Fuel-ups

  Property of jeepin13

• 14.0 Avg MPG

• Sierra

  2020 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2023 • 9 Fuel-ups

  Property of bradford29

• 17.1 Avg MPG

• GMC AT4

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Jun 2022 • 53 Fuel-ups

  Property of furlofoder

• 13.4 Avg MPG

• My Sierra 2500 HD

  2020 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
  Added Sep 2020 • 141 Fuel-ups

  Property of Xaositek

• 16.1 Avg MPG

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