Based on data from 220 vehicles, 24,343 fuel-ups and 7,041,332 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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• Ali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Sep 2021 • 95 Fuel-ups

  Property of WPro

• 16.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 362 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.2 Avg MPG

• GMC 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2019 • 239 Fuel-ups

  Property of slatejoh

• 14.4 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 309 Fuel-ups

  Property of bluez06

• 15.1 Avg MPG

• Team Blue (Truck)

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2022 • 208 Fuel-ups

  Property of TeamBlue

• 15.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed
  Added Dec 2024 • 21 Fuel-ups

  Property of mbishop62

• 12.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 475 Fuel-ups

  Property of Karels

• 16.8 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 461 Fuel-ups

  Property of Arctic388

• 16.3 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 390 Fuel-ups

  Property of MrFastcars

• 14.7 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 431 Fuel-ups

  Property of jarrett85

• 15.2 Avg MPG

• 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

• 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

• 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

• 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

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