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2021 GMC Sierra 3500 HD MPG

Based on data from 37 vehicles, 3,230 fuel-ups and 1,094,730 miles of driving, the 2021 GMC Sierra 3500 HD gets a combined Avg MPG of 13.89 with a 0.15 MPG margin of error.

Below you can see a distribution of the fuel-ups with 16 outliers (0.49%) removed.

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

2021 GMC Sierra 3500 HDs For Sale Nearby

  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added Dec 2020 • 173 Fuel-ups

    Property of Packert

  • 13.6 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Jun 2023 • 203 Fuel-ups

    Property of jillandduane

  • 12.4 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Dec 2020 • 274 Fuel-ups

    Property of SeanAZ

  • 14.2 Avg MPG
  • Sierra 3500 Dually

    2021 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
    Added Mar 2021 • 79 Fuel-ups

    Property of JoshMundy

  • 12.1 Avg MPG
  • 2021 GMC Sierra 3500 HD AT4

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added May 2021 • 152 Fuel-ups

    Property of wbernards

  • 12.8 Avg MPG
  • Duramax

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added May 2021 • 59 Fuel-ups

    Property of schroeder26

  • 12.5 Avg MPG
  • Georgia

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added Jan 2024 • 51 Fuel-ups

    Property of cniehaus

  • 15.8 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added Mar 2022 • 116 Fuel-ups

    Property of hamiltbl2

  • 16.5 Avg MPG
  • 2021 GMC AT4 3500

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Crew Cab Pickup
    Added Nov 2020 • 143 Fuel-ups

    Property of jr32313

  • 14.7 Avg MPG
  • AT4

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Mar 2021 • 256 Fuel-ups

    Property of cowdoc

  • 18.6 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Jun 2021 • 129 Fuel-ups

    Property of kmf620

  • 15.7 Avg MPG
  • GMC

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Mar 2024 • 20 Fuel-ups

    Property of bvermilion

  • 12.9 Avg MPG
  • 2021 Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Feb 2021 • 39 Fuel-ups

    Property of Flatchevy

  • 15.9 Avg MPG
  • Adrian

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Aug 2022 • 150 Fuel-ups

    Property of stu1029

  • 15.5 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Dec 2020 • 125 Fuel-ups

    Property of ivandude44

  • 14.2 Avg MPG
  • Sully

    2021 GMC Sierra 3500 HD AT4 6.6L V8 GAS Automatic 6 Speed
    Added Sep 2021 • 65 Fuel-ups

    Property of kstile

  • 12.9 Avg MPG
  • Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Mar 2021 • 182 Fuel-ups

    Property of rdf1982

  • 12.3 Avg MPG
  • Thor

    2021 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Nov 2021 • 197 Fuel-ups

    Property of jdnewman2021

  • 11.4 Avg MPG
  • AT4

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added May 2021 • 139 Fuel-ups

    Property of jman3794

  • 10.9 Avg MPG
  • 2021 GMC Denali 3500HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Mar 2022 • 61 Fuel-ups

    Property of ob_1jr77

  • 12.8 Avg MPG

Recent Activity

from other GMC Sierra 3500 HD vehicles (View All)

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Honestly the easiest thing you can do to increase mileage th... ...

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