Based on data from 60 vehicles, 4,783 fuel-ups and 1,808,279 miles of driving, the 2018 GMC Sierra 2500 HD gets a combined Avg MPG of 14.53 with a 0.11 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (7) 6.6L V8 DIESEL (53) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (15) Any Submodel Base (2) SLE (3) SLT (22) Denali (33)

Below you can see a distribution of the fuel-ups with 85 outliers (1.75%) removed.

Following shows the average MPG of each of the 60 vehicles in the system.

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• Robin's Truck

  2018 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2021 • 124 Fuel-ups

  Property of Cruiser60

• 14.1 Avg MPG

• 18 Sierra

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2022 • 287 Fuel-ups

  Property of texags06

• 14.1 Avg MPG

• Sierra 2500

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 377 Fuel-ups

  Property of IPAGuy

• 12.1 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2023 • 26 Fuel-ups

  Property of cmlouis

• 14.1 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

• 2018 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Nov 2017 • 146 Fuel-ups

  Property of Rocketrollinsx

• 14.4 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 80 Fuel-ups

  Property of RandD

• 14.3 Avg MPG

• Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 278 Fuel-ups

  Property of superflymtber

• 17.1 Avg MPG

• 18 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 25 Fuel-ups

  Property of peterd55

• 16.9 Avg MPG

• My Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 179 Fuel-ups

  Property of kmh54

• 14.8 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

• Denali 2500HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 140 Fuel-ups

  Property of Mavis500

• 15.4 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

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2018 • 161 Fuel-ups

  Property of cfort

• 14.6 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2019 • 305 Fuel-ups

  Property of 4gkids

• 14.2 Avg MPG

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2020 • 38 Fuel-ups

  Property of beamsf15e

• 14.5 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 233 Fuel-ups

  Property of jtw811

• 14.4 Avg MPG

• Sierra Denali 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 144 Fuel-ups

  Property of west27

• 13.6 Avg MPG

• GMC

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2021 • 169 Fuel-ups

  Property of csundell

• 14.0 Avg MPG

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