Based on data from 28 vehicles, 2,344 fuel-ups and 752,514 miles of driving, the 2018 GMC Sierra 3500 HD gets a combined Avg MPG of 12.14 with a 0.16 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (2) 6.6L V8 DIESEL (25) Any Body Style Crew Cab Pickup (8) Any Submodel SLE (1) Base (2) SLT (5) Denali (20)

Below you can see a distribution of the fuel-ups with 14 outliers (0.59%) removed.

Following shows the average MPG of each of the 28 vehicles in the system.

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• GMC

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2023 • 92 Fuel-ups

  Property of hikyuuri

• 14.7 Avg MPG

• Big Elmo

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 164 Fuel-ups

  Property of Geodude

• 11.0 Avg MPG

• Great White L5P

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 91 Fuel-ups

  Property of 2manyliters

• 14.0 Avg MPG

• Sierra

  2018 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2025 • 478 Fuel-ups

  Property of artman1913

• 11.5 Avg MPG

• Tow Pig

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2018 • 328 Fuel-ups

  Property of Robicus

• 13.1 Avg MPG

• DEF

  2018 GMC Sierra 3500 HD SLT Automatic 6 Speed
  Added Jan 2025 • 49 Fuel-ups

  Property of artman1913

• 510.0 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2024 • 9 Fuel-ups

  Property of SierraBob

• 11.8 Avg MPG

• GMC 3500

  2018 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 72 Fuel-ups

  Property of Peterbuilt75

• 10.9 Avg MPG

• Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 179 Fuel-ups

  Property of jamesnkerr

• 14.0 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2021 • 185 Fuel-ups

  Property of codycourtney2

• 13.7 Avg MPG

• My Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2024 • 3 Fuel-ups

  Property of zachjohnson0726

• 15.5 Avg MPG

• 2018 GMC Sierra 3500HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 166 Fuel-ups

  Property of pputney

• 11.8 Avg MPG

• Denali

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2018 • 125 Fuel-ups

  Property of suasman

• 14.1 Avg MPG

• Pick Up

  2018 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2022 • 4 Fuel-ups

  Property of petestoy

• 14.2 Avg MPG

• GMC Sierra 3500 HD

  2018 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2017 • 90 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 Jul 2020 • 127 Fuel-ups

  Property of tortuga99

• 10.9 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

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