Based on data from 46 vehicles, 3,756 fuel-ups and 1,362,808 miles of driving, the 2015 GMC Sierra 3500 HD gets a combined Avg MPG of 13.58 with a 0.13 MPG margin of error.

Any Engine Type 6.0L V8 CNG (1) 6.0L V8 FLEX (3) 6.0L V8 GAS (1) 6.6L V8 DIESEL (39) DIESEL (1) Any Body Style Crew Cab Pickup (10) Cab & Chassis - Crew Cab (2) Any Submodel Base (5) SLE (5) SLT (8) Denali (27) Other (1)

Below you can see a distribution of the fuel-ups with 60 outliers (1.57%) removed.

Following shows the average MPG of each of the 46 vehicles in the system.

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• 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 176 Fuel-ups

  Property of finchman82

• 14.8 Avg MPG

• Dually

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2020 • 29 Fuel-ups

  Property of Mayne318

• 17.5 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2021 • 3 Fuel-ups

  Property of Daddys-Dually

• 12.0 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2019 • 10 Fuel-ups

  Property of Gordy86

• 14.2 Avg MPG

• White GMC

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 160 Fuel-ups

  Property of jambiefsj

• 14.8 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 19 Fuel-ups

  Property of Pogobird

• 15.1 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 79 Fuel-ups

  Property of exrr35

• 16.5 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 27 Fuel-ups

  Property of lost_okie

• 13.5 Avg MPG

• Gmc 3500

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 254 Fuel-ups

  Property of johndeere160lc

• 13.6 Avg MPG

• GMC HD

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Oct 2018 • 179 Fuel-ups

  Property of dflores81

• 14.2 Avg MPG

• Great white

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2015 • 70 Fuel-ups

  Property of 2manyliters

• 14.4 Avg MPG

• 2015 GMC 3500

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2016 • 192 Fuel-ups

  Property of modoan

• 13.1 Avg MPG

• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2015 • 203 Fuel-ups

  Property of cowdoc

• 19.6 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2015 • 145 Fuel-ups

  Property of exrr35

• 17.5 Avg MPG

• Tims Denali Dually

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2015 • 98 Fuel-ups

  Property of tjflanman

• 11.6 Avg MPG

• GMC 3500

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 46 Fuel-ups

  Property of xrayman

• 17.7 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2017 • 5 Fuel-ups

  Property of chinaay

• 10.7 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2015 • 75 Fuel-ups

  Property of gjtj

• 14.1 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE
  Added May 2016 • 4 Fuel-ups

  Property of Pogobird

• 12.0 Avg MPG

• 2015 Denali 3500

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 110 Fuel-ups

  Property of Kturner

• 15.2 Avg MPG

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