Based on data from 21 vehicles, 2,938 fuel-ups and 841,873 miles of driving, the 2015 GMC Sierra gets a combined Avg MPG of 16.57 with a 0.12 MPG margin of error.

Any Engine Type 5.3L V8 FLEX (1) 5.3L V8 GAS (13) 6.2L V8 GAS (1) Any Body Style Crew Cab Pickup (2) Any Submodel Denali (1) SLE (2) SLT (3) All Terrain (5) Base (8) Other (2)

Below you can see a distribution of the fuel-ups with 233 outliers (7.35%) removed.

Following shows the average MPG of each of the 21 vehicles in the system.

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• My Sierra

  2015 GMC Sierra All Terrain 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 204 Fuel-ups

  Property of frekeyguy

• 18.7 Avg MPG

• 2015 GMC

  2015 GMC Sierra SLE
  Added Jan 2018 • 463 Fuel-ups

  Property of Gimmy

• 18.1 Avg MPG

• My Sierra

  2015 GMC Sierra SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2023 • 70 Fuel-ups

  Property of lsumilk

• 18.2 Avg MPG

• Moms New Wheels

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 439 Fuel-ups

  Property of Momsweetride

• 16.0 Avg MPG

• 2015 GMC

  2015 GMC Sierra SLE
  Added Aug 2021 • 321 Fuel-ups

  Property of octaneforever

• 17.1 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2016 • 36 Fuel-ups

  Property of cheese7007

• 12.5 Avg MPG

• GMC Black

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2016 • 180 Fuel-ups

  Property of JoeShaker

• 14.4 Avg MPG

• 2015 Sierra SLT

  2015 GMC Sierra SLT
  Added Sep 2021 • 4 Fuel-ups

  Property of gksills

• 17.0 Avg MPG

• Truck

  2015 GMC Sierra SLT
  Added Mar 2018 • 199 Fuel-ups

  Property of jabuck99

• 17.4 Avg MPG

• Quick silver

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 202 Fuel-ups

  Property of wrench

• 18.9 Avg MPG

• GMC Sierra SLT

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jul 2019 • 278 Fuel-ups

  Property of ionsense

• 18.1 Avg MPG

• New Truck

  2015 GMC Sierra All Terrain 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 195 Fuel-ups

  Property of navy0010

• 15.5 Avg MPG

• GMC Sierra 2015

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed
  Added May 2018 • 32 Fuel-ups

  Property of Topman500

• 13.1 Avg MPG

• Charity

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 110 Fuel-ups

  Property of mkcollimsworth

• 16.9 Avg MPG

• My Sierra

  2015 GMC Sierra All Terrain 5.3L V8 GAS Automatic 6 Speed
  Added May 2018 • 8 Fuel-ups

  Property of mmhagen74

• 19.5 Avg MPG

• Kent Campbell

  2015 GMC Sierra Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2017 • 244 Fuel-ups

  Property of campbell1108

• 11.2 Avg MPG

• 2015 GMC

  2015 GMC Sierra All Terrain 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2018 • 97 Fuel-ups

  Property of cmac10

• 18.1 Avg MPG

• Sierra

  2015 GMC Sierra Mine
  Added Mar 2017 • 60 Fuel-ups

  Property of kiddjus

• 15.0 Avg MPG

• Ian Fummerton

  2015 GMC Sierra 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 74 Fuel-ups

  Property of fummy

• 15.5 Avg MPG

• 2015 GMC SIERRA

  2015 GMC Sierra LT
  Added Mar 2017 • 56 Fuel-ups

  Property of jimmer2229

• 14.9 Avg MPG

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