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2021 GMC Sierra 3500 HD MPG

Based on data from 37 vehicles, 3,302 fuel-ups and 1,119,651 miles of driving, the 2021 GMC Sierra 3500 HD gets a combined Avg MPG of 13.88 with a 0.15 MPG margin of error.

Below you can see a distribution of the fuel-ups with 17 outliers (0.51%) removed.

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

2021 GMC Sierra 3500 HDs For Sale Nearby

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  • 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
  • Sierra 3500 HD

    2021 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
    Added May 2021 • 44 Fuel-ups

    Property of loricap

  • 15.0 Avg MPG
  • AT4

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Jun 2021 • 95 Fuel-ups

    Property of crossmanj21

  • 14.8 Avg MPG
  • GMC Diesel

    2021 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Apr 2021 • 94 Fuel-ups

    Property of rspeters

  • 13.0 Avg MPG
  • 2021 GMC Sierra 3500 HD Denali

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Mar 2022 • 109 Fuel-ups

    Property of windycitypilot

  • 16.0 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Jul 2021 • 57 Fuel-ups

    Property of rzrscubasteve03

  • 13.4 Avg MPG
  • Odin

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added Mar 2022 • 31 Fuel-ups

    Property of en3chix

  • 11.2 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
    Added Apr 2021 • 36 Fuel-ups

    Property of JBAero

  • 11.1 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Nov 2024 • 19 Fuel-ups

    Property of kdreverman

  • 13.9 Avg MPG
  • Frosty

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Jul 2021 • 8 Fuel-ups

    Property of iammrniceguy

  • 9.3 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD SLT 6.6L V8 GAS Automatic 6 Speed
    Added Jun 2021 • 58 Fuel-ups

    Property of gmc3500

  • 13.0 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Apr 2021 • 66 Fuel-ups

    Property of michael1538

  • 10.7 Avg MPG
  • 2021 GMC Sierra 3500 HD Denali

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Jan 2021 • 34 Fuel-ups

    Property of windycitypilot

  • 14.5 Avg MPG
  • My Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added Sep 2021 • 13 Fuel-ups

    Property of jjchambs

  • 13.4 Avg MPG
  • Bob's Denali

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
    Added Jun 2022 • 27 Fuel-ups

    Property of Pierce56

  • 10.6 Avg MPG
  • 2021 Sierra 3500 HD

    2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
    Added May 2021 • 21 Fuel-ups

    Property of joshuaw

  • 11.5 Avg MPG
  • My Sierra 3500 HD

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

    Property of Benilac20

  • 13.0 Avg MPG
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