Based on data from 218 vehicles, 23,591 fuel-ups and 6,842,533 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.71 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (14) 5.3L V8 FLEX (49) 5.3L V8 GAS (114) 6.2L V8 GAS (40) Any Body Style Extended Cab Pickup (24) Crew Cab Pickup (67) Any Submodel Base (14) Denali (35) SLE (65) SLT (103) Other (1)

Below you can see a distribution of the fuel-ups with 723 outliers (2.97%) removed.

Following shows the average MPG of each of the 218 vehicles in the system.

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• My GMC 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2017 • 293 Fuel-ups

  Property of bjsgasdata

• 16.1 Avg MPG

• Sierra All Terrain

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2015 • 252 Fuel-ups

  Property of Gilles

• 17.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 460 Fuel-ups

  Property of CurtK

• 16.5 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 258 Fuel-ups

  Property of Shakora

• 14.1 Avg MPG

• Ali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Sep 2021 • 92 Fuel-ups

  Property of WPro

• 16.4 Avg MPG

• Sierra Z-71

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 340 Fuel-ups

  Property of acmurf1

• 17.1 Avg MPG

• Gmc

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 295 Fuel-ups

  Property of StanIROCZ

• 16.4 Avg MPG

• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 397 Fuel-ups

  Property of humenfly

• 17.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 468 Fuel-ups

  Property of Karels

• 16.8 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 340 Fuel-ups

  Property of mnvik28

• 14.6 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 372 Fuel-ups

  Property of MrFastcars

• 14.6 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 361 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• GMC Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Aug 2017 • 256 Fuel-ups

  Property of eddykc03

• 15.4 Avg MPG

• Team Blue (Truck)

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2022 • 205 Fuel-ups

  Property of TeamBlue

• 15.6 Avg MPG

• BlueFishDogTooth III

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2019 • 203 Fuel-ups

  Property of dennisp2938

• 13.3 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 416 Fuel-ups

  Property of mnetland

• 18.5 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 304 Fuel-ups

  Property of bluez06

• 15.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2024 • 4 Fuel-ups

  Property of jlangham

• 15.6 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 426 Fuel-ups

  Property of jarrett85

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2023 • 68 Fuel-ups

  Property of kblunt

• 16.2 Avg MPG

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