Based on data from 59 vehicles, 4,395 fuel-ups and 1,672,037 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 (1.55%) removed.

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

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• My Sierra

  2018 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2018 • 36 Fuel-ups

  Property of Burple

• 11.4 Avg MPG

• 2018 GMC Sierra HD Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2017 • 73 Fuel-ups

  Property of klieber

• 15.0 Avg MPG

• Truck

  2018 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 37 Fuel-ups

  Property of Duckhunter

• 16.4 Avg MPG

• BlacKnight

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2018 • 41 Fuel-ups

  Property of jcmisze

• 13.7 Avg MPG

• My Sierra 2500 HD

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

  Property of jamesthebikeguy

• 11.4 Avg MPG

• Denali 2500HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2018 • 28 Fuel-ups

  Property of MitchM58

• 17.1 Avg MPG

• Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2018 • 88 Fuel-ups

  Property of M_KWISE

• 17.0 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 83 Fuel-ups

  Property of TheMekanik

• 15.5 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2019 • 10 Fuel-ups

  Property of slecrew

• 17.3 Avg MPG

• My Denali HD

  2018 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Apr 2019 • 4 Fuel-ups

  Property of Renegades

• 13.9 Avg MPG

• Granite Denali

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2018 • 21 Fuel-ups

  Property of rjacobs

• 16.5 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2018 • 51 Fuel-ups

  Property of Roadwarrior32

• 14.8 Avg MPG

• Gimmy Black™

  2018 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 21 Fuel-ups

  Property of Abercrombies

• 12.4 Avg MPG

• My Sierra 2500 HD

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

  Property of geddingtonfire

• 13.3 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 3 Fuel-ups

  Property of conepunter

• 18.3 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 15 Fuel-ups

  Property of sshiggins

• 14.9 Avg MPG

• My Sierra 2500 HD

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

  Property of Badheadla

• 15.3 Avg MPG

• My Sierra 2500 HD

  2018 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2017 • 13 Fuel-ups

  Property of joelwalters12

• 15.6 Avg MPG

• My Sierra 2500 HD

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

  Property of PanigaleJohn

• 11.8 Avg MPG

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