Based on data from 224 vehicles, 24,166 fuel-ups and 7,029,845 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.75 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (14) 5.3L V8 FLEX (51) 5.3L V8 GAS (116) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (24) Crew Cab Pickup (69) Any Submodel Base (14) Denali (37) SLE (68) SLT (104) Other (1)

Below you can see a distribution of the fuel-ups with 1549 outliers (6.02%) removed.

Following shows the average MPG of each of the 224 vehicles in the system.

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• Sierra Z-71

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 347 Fuel-ups

  Property of acmurf1

• 17.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed
  Added Dec 2024 • 62 Fuel-ups

  Property of mbishop62

• 14.4 Avg MPG

• My GMC 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2017 • 309 Fuel-ups

  Property of bjsgasdata

• 16.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2023 • 131 Fuel-ups

  Property of Nholley

• 17.7 Avg MPG

• BlueFishDogTooth III

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2019 • 227 Fuel-ups

  Property of dennisp2938

• 13.5 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Dec 2024 • 616 Fuel-ups

  Property of FLDawg

• 15.2 Avg MPG

• Ali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Sep 2021 • 110 Fuel-ups

  Property of WPro

• 16.3 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 388 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2023 • 88 Fuel-ups

  Property of kblunt

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2023 • 96 Fuel-ups

  Property of Hetelle

• 15.3 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 362 Fuel-ups

  Property of mnvik28

• 14.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 45 Fuel-ups

  Property of jc5570

• 15.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2025 • 14 Fuel-ups

  Property of 435hornhunter

• 16.7 Avg MPG

• Team Blue (Truck)

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2022 • 234 Fuel-ups

  Property of TeamBlue

• 15.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2021 • 134 Fuel-ups

  Property of kyleiowa

• 16.1 Avg MPG

• GMC Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2020 • 216 Fuel-ups

  Property of Chuck16785

• 17.4 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 • 162 Fuel-ups

  Property of Freeweeling

• 18.4 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jan 2025 • 7 Fuel-ups

  Property of GerryG62

• 15.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Apr 2025 • 10 Fuel-ups

  Property of djmoose_1272

• 16.0 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 435 Fuel-ups

  Property of mnetland

• 18.4 Avg MPG

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