Based on data from 32 vehicles, 2,439 fuel-ups and 934,906 miles of driving, the 2015 GMC Sierra 3500 HD gets a combined Avg MPG of 14.18 with a 0.17 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (3) 6.0L V8 GAS (1) 6.6L V8 DIESEL (26) DIESEL (1) Any Body Style Crew Cab Pickup (5) Cab & Chassis - Crew Cab (2) Any Submodel Base (4) SLE (4) SLT (5) Denali (18) Other (1)

Below you can see a distribution of the fuel-ups with 26 outliers (1.05%) removed.

Following shows the average MPG of each of the 32 vehicles in the system.

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• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 16 Fuel-ups

  Property of Pogobird

• 14.6 Avg MPG

• White GMC

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 150 Fuel-ups

  Property of jambiefsj

• 14.8 Avg MPG

• 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 83 Fuel-ups

  Property of finchman82

• 15.4 Avg MPG

• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2018 • 75 Fuel-ups

  Property of marcottemw

• 11.8 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD 6.0L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 14 Fuel-ups

  Property of jjj4x4

• 8.5 Avg MPG

• 2015 3500 Sierra

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2019 • 21 Fuel-ups

  Property of NJFF41

• 15.3 Avg MPG

• GMC Hd

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Oct 2018 • 160 Fuel-ups

  Property of dflores81

• 13.8 Avg MPG

• GMC Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2018 • 17 Fuel-ups

  Property of CAPaul

• 12.6 Avg MPG

• Little Red Wagon

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 215 Fuel-ups

  Property of ANK01

• 14.6 Avg MPG

• Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2018 • 62 Fuel-ups

  Property of Crash

• 14.0 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 Apr 2018 • 51 Fuel-ups

  Property of tbelllis1963

• 15.0 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 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

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