Based on data from 218 vehicles, 23,500 fuel-ups and 6,813,918 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.72 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (14) 5.3L V8 FLEX (48) 5.3L V8 GAS (114) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (25) Crew Cab Pickup (67) Any Submodel Base (14) Denali (35) SLE (64) SLT (104) Other (1)

Below you can see a distribution of the fuel-ups with 723 outliers (2.98%) removed.

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

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• Sierra

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Oct 2017 • 234 Fuel-ups

  Property of rguerrer93

• 16.0 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 334 Fuel-ups

  Property of mnvik28

• 14.6 Avg MPG

• GMC 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2019 • 224 Fuel-ups

  Property of slatejoh

• 14.5 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 413 Fuel-ups

  Property of mnetland

• 18.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 458 Fuel-ups

  Property of Karels

• 16.8 Avg MPG

• Team Blue (Truck)

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2022 • 200 Fuel-ups

  Property of TeamBlue

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 351 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2020 • 53 Fuel-ups

  Property of Selway

• 16.8 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 420 Fuel-ups

  Property of jarrett85

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2021 • 58 Fuel-ups

  Property of Colton1500

• 13.7 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 254 Fuel-ups

  Property of Shakora

• 14.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2023 • 60 Fuel-ups

  Property of kblunt

• 16.1 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 356 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• BlueFishDogTooth III

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2019 • 194 Fuel-ups

  Property of dennisp2938

• 13.2 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 359 Fuel-ups

  Property of MrFastcars

• 14.6 Avg MPG

• Gmc

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 291 Fuel-ups

  Property of StanIROCZ

• 16.4 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 301 Fuel-ups

  Property of bluez06

• 15.1 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 3 Fuel-ups

  Property of KyleStu

• 28.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2023 • 67 Fuel-ups

  Property of Hetelle

• 15.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 374 Fuel-ups

  Property of dustin8201

• 14.5 Avg MPG

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