Based on data from 46 vehicles, 3,760 fuel-ups and 1,364,054 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 61 outliers (1.60%) removed.

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

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• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2022 • 40 Fuel-ups

  Property of dek781

• 15.9 Avg MPG

• GMC Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2018 • 96 Fuel-ups

  Property of CAPaul

• 12.3 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD 6.0L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 93 Fuel-ups

  Property of jjj4x4

• 9.3 Avg MPG

• Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2023 • 573 Fuel-ups

  Property of Brucelas

• 12.0 Avg MPG

• Nali

  2015 GMC Sierra 3500 HD Denali 6.0L V8 CNG Automatic 6 Speed
  Added Jul 2023 • 30 Fuel-ups

  Property of Sober-Tony

• 11.5 Avg MPG

• R2D2

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2021 • 69 Fuel-ups

  Property of Klass7

• 12.6 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2021 • 37 Fuel-ups

  Property of RJenkins

• 15.6 Avg MPG

• Big Spud

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2024 • 3 Fuel-ups

  Property of tiffanykorn

• 15.7 Avg MPG

• GMC Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2022 • 51 Fuel-ups

  Property of nascardreamin

• 13.3 Avg MPG

• Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 50 Fuel-ups

  Property of Tx_Rebel

• 12.5 Avg MPG

• 2015 GMC Sierra 3500 HD Denali

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2018 • 137 Fuel-ups

  Property of tbelllis1963

• 15.2 Avg MPG

• 2015 3500 Sierra

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 96 Fuel-ups

  Property of NJFF41

• 14.3 Avg MPG

• Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2018 • 168 Fuel-ups

  Property of Crash

• 14.3 Avg MPG

• 2015 GMC 3500HD

  2015 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2023 • 12 Fuel-ups

  Property of kenaxcix

• 12.8 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 15 Fuel-ups

  Property of 1500HD

• 14.0 Avg MPG

• GMC Hd

  2015 GMC Sierra 3500 HD 6.6L V8 DIESEL Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Oct 2018 • 416 Fuel-ups

  Property of dflores81

• 13.7 Avg MPG

• Little Red Wagon

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2018 • 321 Fuel-ups

  Property of ANK01

• 15.1 Avg MPG

• Sierra 3500HD

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Apr 2021 • 113 Fuel-ups

  Property of abonini

• 15.0 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2021 • 40 Fuel-ups

  Property of crashper

• 14.9 Avg MPG

• My Sierra 3500 HD

  2015 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 28 Fuel-ups

  Property of fatalberts

• 10.7 Avg MPG

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