Based on data from 59 vehicles, 4,400 fuel-ups and 1,673,672 miles of driving, the 2018 GMC Sierra 2500 HD gets a combined Avg MPG of 14.56 with a 0.11 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (7) 6.6L V8 DIESEL (52) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (15) Any Submodel Base (2) SLE (3) SLT (22) Denali (32)

Below you can see a distribution of the fuel-ups with 69 outliers (1.54%) removed.

Following shows the average MPG of each of the 59 vehicles in the system.

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• Denali HD

  2018 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Jun 2020 • 132 Fuel-ups

  Property of Sullivan907

• 13.2 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 54 Fuel-ups

  Property of RandD

• 14.2 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2021 • 166 Fuel-ups

  Property of long003

• 16.0 Avg MPG

• 18 Sierra

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2022 • 261 Fuel-ups

  Property of texags06

• 14.2 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2023 • 7 Fuel-ups

  Property of Whistle

• 15.0 Avg MPG

• 18 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 13 Fuel-ups

  Property of peterd55

• 16.8 Avg MPG

• My Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 136 Fuel-ups

  Property of kmh54

• 15.7 Avg MPG

• Sierra 2500

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 351 Fuel-ups

  Property of IPAGuy

• 11.9 Avg MPG

• GMC AT HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2023 • 24 Fuel-ups

  Property of jheen

• 14.3 Avg MPG

• Sierra Denali 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 132 Fuel-ups

  Property of west27

• 13.7 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2023 • 13 Fuel-ups

  Property of cmlouis

• 13.9 Avg MPG

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2020 • 36 Fuel-ups

  Property of beamsf15e

• 14.6 Avg MPG

• GMC

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2021 • 141 Fuel-ups

  Property of csundell

• 13.5 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2019 • 265 Fuel-ups

  Property of 4gkids

• 14.1 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 220 Fuel-ups

  Property of jtw811

• 14.4 Avg MPG

• Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 263 Fuel-ups

  Property of superflymtber

• 17.2 Avg MPG

• Robin's Truck

  2018 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2021 • 90 Fuel-ups

  Property of Cruiser60

• 14.3 Avg MPG

• Denali 2500HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 124 Fuel-ups

  Property of Mavis500

• 15.4 Avg MPG

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added May 2019 • 148 Fuel-ups

  Property of larboy

• 11.9 Avg MPG

• 2018 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Nov 2017 • 121 Fuel-ups

  Property of Rocketrollinsx

• 14.5 Avg MPG

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