Based on data from 28 vehicles, 1,897 fuel-ups and 708,823 miles of driving, the 2015 GMC Sierra 3500 HD gets a combined Avg MPG of 14.49 with a 0.20 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (2) 6.0L V8 GAS (1) 6.6L V8 DIESEL (23) DIESEL (1) Any Body Style Crew Cab Pickup (5) Any Submodel Base (1) SLE (4) SLT (4) Denali (18) Other (1)

Below you can see a distribution of the fuel-ups with 23 outliers (1.20%) removed.

Following shows the average MPG of each of the 28 vehicles in the system.

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• Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2018 • 16 Fuel-ups

  Property of Crash

• 13.7 Avg MPG

• Gmc 3500

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 232 Fuel-ups

  Property of johndeere160lc

• 13.7 Avg MPG

• 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 31 Fuel-ups

  Property of finchman82

• 15.0 Avg MPG

• Little Red Wagon

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 163 Fuel-ups

  Property of ANK01

• 14.2 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 34 Fuel-ups

  Property of exrr35

• 17.7 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2018 • 20 Fuel-ups

  Property of tbelllis1963

• 15.5 Avg MPG

• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2018 • 23 Fuel-ups

  Property of marcottemw

• 10.9 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

• Guzzler

  2015 GMC Sierra 3500 HD SLT 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 88 Fuel-ups

  Property of Camstyn

• 10.5 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

• White GMC

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 76 Fuel-ups

  Property of jambiefsj

• 13.0 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

• 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 SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 10 Fuel-ups

  Property of Pogobird

• 11.3 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

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