Based on data from 62 vehicles, 4,869 fuel-ups and 1,834,300 miles of driving, the 2018 GMC Sierra 2500 HD gets a combined Avg MPG of 14.51 with a 0.11 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (8) 6.6L V8 DIESEL (54) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (16) Any Submodel Base (2) SLE (3) SLT (23) Denali (34)

Below you can see a distribution of the fuel-ups with 109 outliers (2.19%) removed.

Following shows the average MPG of each of the 62 vehicles in the system.

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• Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added May 2019 • 180 Fuel-ups

  Property of larboy

• 13.4 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2024 • 14 Fuel-ups

  Property of bugaboots

• 9.8 Avg MPG

• Sierra 2500

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 379 Fuel-ups

  Property of IPAGuy

• 12.1 Avg MPG

• 18 Sierra

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2022 • 289 Fuel-ups

  Property of texags06

• 14.1 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 82 Fuel-ups

  Property of RandD

• 14.3 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2023 • 28 Fuel-ups

  Property of cmlouis

• 14.0 Avg MPG

• 2018 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Nov 2017 • 148 Fuel-ups

  Property of Rocketrollinsx

• 14.4 Avg MPG

• Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 279 Fuel-ups

  Property of superflymtber

• 17.1 Avg MPG

• Robin's Truck

  2018 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2021 • 127 Fuel-ups

  Property of Cruiser60

• 14.2 Avg MPG

• My Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 180 Fuel-ups

  Property of kmh54

• 14.8 Avg MPG

• Sierra Denali 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 145 Fuel-ups

  Property of west27

• 13.7 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2018 • 162 Fuel-ups

  Property of cfort

• 14.6 Avg MPG

• Denali 2500HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 141 Fuel-ups

  Property of Mavis500

• 15.4 Avg MPG

• GMC

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2021 • 171 Fuel-ups

  Property of csundell

• 14.0 Avg MPG

• 18 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 26 Fuel-ups

  Property of peterd55

• 16.8 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 234 Fuel-ups

  Property of jtw811

• 14.4 Avg MPG

• GMC AT HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2023 • 30 Fuel-ups

  Property of jheen

• 14.4 Avg MPG

• 18 Denali HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2024 • 28 Fuel-ups

  Property of AeroTerp

• 12.1 Avg MPG

• Red Tank 15/40

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 39 Fuel-ups

  Property of jdelfin

• 15.0 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 8 Fuel-ups

  Property of Badheadla

• 15.3 Avg MPG

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