Based on data from 20 vehicles, 1,323 fuel-ups and 499,134 miles of driving, the 2015 GMC Sierra 3500 HD gets a combined Avg MPG of 14.43 with a 0.24 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (1) 6.0L V8 GAS (1) 6.6L V8 DIESEL (16) DIESEL (1) Any Body Style Crew Cab Pickup (4) Any Submodel Base (1) SLE (3) SLT (3) Denali (12) Other (1)

Below you can see a distribution of the fuel-ups with 18 outliers (1.34%) removed.

Following shows the average MPG of each of the 20 vehicles in the system.

• White GMC

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 54 Fuel-ups

  Property of jambiefsj

• 13.0 Avg MPG

• Great white

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2015 • 56 Fuel-ups

  Property of 2manyliters

• 14.3 Avg MPG

• Gmc 3500

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 146 Fuel-ups

  Property of johndeere160lc

• 13.8 Avg MPG

• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2015 • 154 Fuel-ups

  Property of cowdoc

• 19.5 Avg MPG

• 2015 GMC 3500

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 204 Fuel-ups

  Property of nbomar1

• 14.1 Avg MPG

• GMC 3500

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 39 Fuel-ups

  Property of xrayman

• 17.6 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2015 • 116 Fuel-ups

  Property of exrr35

• 18.2 Avg MPG

• 2015 GMC 3500

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2016 • 149 Fuel-ups

  Property of modoan

• 13.3 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 9 Fuel-ups

  Property of Pogobird

• 11.4 Avg MPG

• Guzzler

  2015 GMC Sierra 3500 HD SLT 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 73 Fuel-ups

  Property of Camstyn

• 10.5 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

• Tims Denali Dually

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2015 • 94 Fuel-ups

  Property of tjflanman

• 11.6 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

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2016 • 16 Fuel-ups

  Property of tobedestyn

• 9.8 Avg MPG

• GMC Sierra 3500 Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2016 • 29 Fuel-ups

  Property of rkt4796606

• 11.3 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2015 • 5 Fuel-ups

  Property of 750hpDenali

• 12.5 Avg MPG

• Blue Dually

  2015 GMC Sierra 3500 HD Denali 6.6L DIESEL V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Apr 2015 • 58 Fuel-ups

  Property of BigJon

• 12.5 Avg MPG

• Denali HD

  2015 GMC Sierra 3500 HD Denali 6.6L DIESEL V8 Automatic 6
  Added Jun 2014 • 12 Fuel-ups

  Property of fury

• 13.5 Avg MPG

• whitey

  2015 GMC Sierra 3500 HD DIESEL
  Added Apr 2014 • 3 Fuel-ups

  Property of jbuff

• 14.6 Avg MPG