Based on data from 220 vehicles, 24,333 fuel-ups and 7,038,438 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.69 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 (115) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (24) Crew Cab Pickup (68) Any Submodel Base (14) Denali (35) SLE (66) SLT (104) Other (1)

Below you can see a distribution of the fuel-ups with 743 outliers (2.96%) removed.

Following shows the average MPG of each of the 220 vehicles in the system.

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• BlueFishDogTooth III

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2019 • 207 Fuel-ups

  Property of dennisp2938

• 13.3 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 389 Fuel-ups

  Property of MrFastcars

• 14.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2023 • 76 Fuel-ups

  Property of kblunt

• 16.0 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 366 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• GMC 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2019 • 238 Fuel-ups

  Property of slatejoh

• 14.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2021 • 61 Fuel-ups

  Property of Colton1500

• 13.7 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 345 Fuel-ups

  Property of mnvik28

• 14.6 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 378 Fuel-ups

  Property of dustin8201

• 14.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 361 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.2 Avg MPG

• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 398 Fuel-ups

  Property of humenfly

• 17.4 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 264 Fuel-ups

  Property of Shakora

• 14.1 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added May 2020 • 113 Fuel-ups

  Property of richardmnagle

• 10.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Dec 2024 • 588 Fuel-ups

  Property of FLDawg

• 15.2 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 419 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 Aug 2023 • 120 Fuel-ups

  Property of Nholley

• 17.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 474 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 • 207 Fuel-ups

  Property of TeamBlue

• 15.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 469 Fuel-ups

  Property of CurtK

• 16.5 Avg MPG

• Gmc

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 301 Fuel-ups

  Property of StanIROCZ

• 16.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2021 • 99 Fuel-ups

  Property of kyleiowa

• 16.0 Avg MPG

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