Based on data from 220 vehicles, 23,685 fuel-ups and 6,894,292 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.76 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 1525 outliers (6.05%) removed.

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

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• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2021 • 104 Fuel-ups

  Property of kyleiowa

• 16.0 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic Crew Cab Pickup
  Added Dec 2024 • 595 Fuel-ups

  Property of FLDawg

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 368 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added May 2018 • 91 Fuel-ups

  Property of arcasey1989

• 13.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Nov 2019 • 109 Fuel-ups

  Property of Musang

• 15.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2023 • 123 Fuel-ups

  Property of Nholley

• 17.9 Avg MPG

• Sierra All Terrain

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2015 • 255 Fuel-ups

  Property of Gilles

• 17.1 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 422 Fuel-ups

  Property of mnetland

• 18.5 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 269 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 • 78 Fuel-ups

  Property of kblunt

• 15.9 Avg MPG

• GMC Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2020 • 194 Fuel-ups

  Property of Chuck16785

• 17.2 Avg MPG

• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 399 Fuel-ups

  Property of humenfly

• 17.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 43 Fuel-ups

  Property of jc5570

• 15.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 115 Fuel-ups

  Property of Clemsonfan15

• 16.0 Avg MPG

• GMC 1500 Crew

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2019 • 181 Fuel-ups

  Property of wingbase

• 11.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2018 • 152 Fuel-ups

  Property of Hash59

• 17.3 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2024 • 5 Fuel-ups

  Property of Jdethington

• 15.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Jul 2023 • 24 Fuel-ups

  Property of bowiesbesthick

• 14.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 471 Fuel-ups

  Property of CurtK

• 16.5 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 • 159 Fuel-ups

  Property of Freeweeling

• 18.4 Avg MPG

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