Based on data from 31 vehicles, 2,095 fuel-ups and 796,606 miles of driving, the 2015 GMC Sierra 3500 HD gets a combined Avg MPG of 14.23 with a 0.19 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (3) 6.0L V8 GAS (1) 6.6L V8 DIESEL (25) DIESEL (1) Any Body Style Crew Cab Pickup (5) Cab & Chassis - Crew Cab (2) Any Submodel Base (3) SLE (4) SLT (5) Denali (18) Other (1)

Below you can see a distribution of the fuel-ups with 25 outliers (1.18%) removed.

Following shows the average MPG of each of the 31 vehicles in the system.

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• GMC Hd

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Oct 2018 • 22 Fuel-ups

  Property of dflores81

• 14.1 Avg MPG

• Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2018 • 21 Fuel-ups

  Property of Crash

• 13.9 Avg MPG

• 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 40 Fuel-ups

  Property of finchman82

• 15.1 Avg MPG

• GMC Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2018 • 4 Fuel-ups

  Property of CAPaul

• 10.9 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

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 42 Fuel-ups

  Property of exrr35

• 17.5 Avg MPG

• White GMC

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 82 Fuel-ups

  Property of jambiefsj

• 13.1 Avg MPG

• Little Red Wagon

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 177 Fuel-ups

  Property of ANK01

• 14.4 Avg MPG

• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2018 • 33 Fuel-ups

  Property of marcottemw

• 11.4 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2018 • 29 Fuel-ups

  Property of tbelllis1963

• 15.2 Avg MPG

• Guzzler

  2015 GMC Sierra 3500 HD SLT 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 93 Fuel-ups

  Property of Camstyn

• 10.5 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

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 11 Fuel-ups

  Property of lost_okie

• 11.9 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 Sep 2016 • 256 Fuel-ups

  Property of nbomar1

• 13.9 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

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