Based on data from 215 vehicles, 22,975 fuel-ups and 6,659,201 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 (47) 5.3L V8 GAS (112) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (25) Crew Cab Pickup (66) Any Submodel Base (14) Denali (35) SLE (63) SLT (102) Other (1)

Below you can see a distribution of the fuel-ups with 718 outliers (3.03%) removed.

Following shows the average MPG of each of the 215 vehicles in the system.

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• GMC 1500 Crew

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2019 • 176 Fuel-ups

  Property of wingbase

• 11.9 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 330 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 23 Fuel-ups

  Property of IceYeti7

• 13.3 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added May 2020 • 200 Fuel-ups

  Property of jurbin

• 15.9 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 395 Fuel-ups

  Property of mnetland

• 18.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 110 Fuel-ups

  Property of Clemsonfan15

• 16.0 Avg MPG

• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 381 Fuel-ups

  Property of humenfly

• 17.5 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2016 • 286 Fuel-ups

  Property of Mike1ch

• 13.2 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2017 • 263 Fuel-ups

  Property of giro

• 15.2 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2015 • 340 Fuel-ups

  Property of peterv

• 13.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2018 • 142 Fuel-ups

  Property of Hash59

• 17.3 Avg MPG

• Team Blue (Truck)

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2022 • 183 Fuel-ups

  Property of TeamBlue

• 15.8 Avg MPG

• Sierra All Terrain

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2015 • 235 Fuel-ups

  Property of Gilles

• 17.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2021 • 47 Fuel-ups

  Property of macbot2000

• 12.4 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 246 Fuel-ups

  Property of Shakora

• 14.1 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 337 Fuel-ups

  Property of MrFastcars

• 14.5 Avg MPG

• 2015 GMC SIERRA CREW CAB

  2015 GMC Sierra 1500 SLT 6.2L GAS V8 Automatic 8 Crew Cab Pickup (4 Door)
  Added May 2015 • 153 Fuel-ups

  Property of Freeweeling

• 18.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Nov 2019 • 92 Fuel-ups

  Property of Musang

• 15.0 Avg MPG

• Ali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Sep 2021 • 76 Fuel-ups

  Property of WPro

• 16.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 38 Fuel-ups

  Property of jc5570

• 15.5 Avg MPG

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