Based on data from 24 vehicles, 1,362 fuel-ups and 452,567 miles of driving, the 2018 GMC Sierra 3500 HD gets a combined Avg MPG of 11.78 with a 0.22 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (2) 6.6L V8 DIESEL (21) Any Body Style Crew Cab Pickup (6) Any Submodel Base (2) SLT (4) Denali (18)

Below you can see a distribution of the fuel-ups with 3 outliers (0.22%) removed.

Following shows the average MPG of each of the 24 vehicles in the system.

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• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2020 • 113 Fuel-ups

  Property of tortuga99

• 11.0 Avg MPG

• Big Elmo

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 113 Fuel-ups

  Property of Geodude

• 10.9 Avg MPG

• GMC Sierra 3500HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 111 Fuel-ups

  Property of pputney

• 12.0 Avg MPG

• Great White L5P

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 60 Fuel-ups

  Property of 2manyliters

• 13.7 Avg MPG

• Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 134 Fuel-ups

  Property of jamesnkerr

• 14.1 Avg MPG

• Denali

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2018 • 51 Fuel-ups

  Property of suasman

• 15.0 Avg MPG

• Tow Pig

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2018 • 187 Fuel-ups

  Property of Robicus

• 14.5 Avg MPG

• GMC Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2017 • 86 Fuel-ups

  Property of amtrak8

• 13.1 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2021 • 102 Fuel-ups

  Property of codycourtney2

• 11.9 Avg MPG

• GMC 3500

  2018 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 50 Fuel-ups

  Property of Peterbuilt75

• 11.0 Avg MPG

• Sierra 3500 HD RV Hauler

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2020 • 109 Fuel-ups

  Property of Derril

• 11.9 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2018 • 155 Fuel-ups

  Property of brizgislawrencej

• 13.0 Avg MPG

• CB Denali

  2018 GMC Sierra 3500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Jul 2019 • 11 Fuel-ups

  Property of KTBHDH

• 9.2 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 47 Fuel-ups

  Property of skinnertonoutlaw

• 8.7 Avg MPG

• Denali 3500 DWR

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2018 • 13 Fuel-ups

  Property of Ncrzrbk

• 14.9 Avg MPG

• 2018 Max

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 93 Fuel-ups

  Property of broit

• 12.7 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 4 Fuel-ups

  Property of mps446

• 14.3 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 14 Fuel-ups

  Property of dogspike

• 14.2 Avg MPG

• Sierra

  2018 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 50 Fuel-ups

  Property of artman1913

• 10.8 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2020 • 6 Fuel-ups

  Property of dboyznme

• 14.8 Avg MPG

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