Based on data from 56 vehicles, 3,923 fuel-ups and 1,531,806 miles of driving, the 2018 GMC Sierra 2500 HD gets a combined Avg MPG of 14.80 with a 0.11 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (7) 6.6L V8 DIESEL (49) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (13) Any Submodel Base (2) SLE (3) SLT (20) Denali (31)

Below you can see a distribution of the fuel-ups with 64 outliers (1.61%) removed.

Following shows the average MPG of each of the 56 vehicles in the system.

• «
• 1
• 2
• 3
• »

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2020 • 19 Fuel-ups

  Property of beamsf15e

• 15.0 Avg MPG

• Denali 2500HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 102 Fuel-ups

  Property of Mavis500

• 15.5 Avg MPG

• Robin's Truck

  2018 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2021 • 55 Fuel-ups

  Property of Cruiser60

• 14.2 Avg MPG

• GMC

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2021 • 101 Fuel-ups

  Property of csundell

• 13.0 Avg MPG

• 2018 Sierra Denali HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2018 • 229 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 Sep 2017 • 182 Fuel-ups

  Property of tstanley2128

• 16.0 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2021 • 105 Fuel-ups

  Property of long003

• 16.5 Avg MPG

• 18 Sierra

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2022 • 225 Fuel-ups

  Property of texags06

• 14.4 Avg MPG

• Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Dec 2017 • 236 Fuel-ups

  Property of jlawles2

• 15.1 Avg MPG

• GMC AT HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2023 • 3 Fuel-ups

  Property of jheen

• 17.1 Avg MPG

• Denali HD

  2018 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Jun 2020 • 89 Fuel-ups

  Property of Sullivan907

• 13.2 Avg MPG

• Sierra 2500

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2018 • 256 Fuel-ups

  Property of IPAGuy

• 12.2 Avg MPG

• 2018 Duramax

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Nov 2017 • 97 Fuel-ups

  Property of Rocketrollinsx

• 14.6 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2023 • 4 Fuel-ups

  Property of pcurran63

• 14.9 Avg MPG

• Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 239 Fuel-ups

  Property of superflymtber

• 17.3 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2018 • 91 Fuel-ups

  Property of Boerklong

• 16.2 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2018 • 128 Fuel-ups

  Property of cfort

• 14.4 Avg MPG

• Sierra Denali 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 113 Fuel-ups

  Property of west27

• 13.7 Avg MPG

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added May 2019 • 113 Fuel-ups

  Property of larboy

• 12.4 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

• «
• 1
• 2
• 3
• »