Based on data from 53 vehicles, 2,810 fuel-ups and 1,134,613 miles of driving, the 2018 GMC Sierra 2500 HD gets a combined Avg MPG of 15.06 with a 0.13 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (7) 6.6L V8 DIESEL (46) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (11) Any Submodel Base (2) SLE (2) SLT (19) Denali (30)

Below you can see a distribution of the fuel-ups with 35 outliers (1.23%) removed.

Following shows the average MPG of each of the 53 vehicles in the system.

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• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2019 • 108 Fuel-ups

  Property of 4gkids

• 14.4 Avg MPG

• 2018 Sierra Denali HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2018 • 137 Fuel-ups

  Property of xstaski

• 15.2 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2021 • 11 Fuel-ups

  Property of long003

• 16.5 Avg MPG

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added May 2019 • 61 Fuel-ups

  Property of larboy

• 12.0 Avg MPG

• GMC Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 191 Fuel-ups

  Property of LouLee

• 15.6 Avg MPG

• Sierra Denali 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 64 Fuel-ups

  Property of west27

• 13.7 Avg MPG

• Denali HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 61 Fuel-ups

  Property of Mavis500

• 15.1 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2018 • 72 Fuel-ups

  Property of cfort

• 14.5 Avg MPG

• Denali HD

  2018 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Jun 2020 • 42 Fuel-ups

  Property of Sullivan907

• 13.2 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 148 Fuel-ups

  Property of jtw811

• 14.7 Avg MPG

• Ken’s

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2020 • 21 Fuel-ups

  Property of Cave0369

• 15.6 Avg MPG

• Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 163 Fuel-ups

  Property of superflymtber

• 17.4 Avg MPG

• 18 Sierra

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2018 • 154 Fuel-ups

  Property of texags06

• 14.6 Avg MPG

• GMC

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2021 • 7 Fuel-ups

  Property of csundell

• 12.0 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Feb 2021 • 5 Fuel-ups

  Property of williamsm5813

• 13.8 Avg MPG

• Sierra 2500

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

  Property of IPAGuy

• 12.3 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

• 2018 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Nov 2017 • 58 Fuel-ups

  Property of Rocketrollinsx

• 14.4 Avg MPG

• GMC Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2021 • 4 Fuel-ups

  Property of Krixus

• 13.0 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2017 • 142 Fuel-ups

  Property of tstanley2128

• 16.2 Avg MPG

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