Based on data from 214 vehicles, 22,058 fuel-ups and 6,434,686 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.77 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (14) 5.3L V8 FLEX (47) 5.3L V8 GAS (109) 6.2L V8 GAS (41) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (25) Crew Cab Pickup (65) Any Submodel Base (14) Denali (35) SLE (62) SLT (100) Other (3)

Below you can see a distribution of the fuel-ups with 665 outliers (2.93%) removed.

Following shows the average MPG of each of the 214 vehicles in the system.

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• Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2017 • 236 Fuel-ups

  Property of giro

• 15.5 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 315 Fuel-ups

  Property of MrFastcars

• 14.5 Avg MPG

• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 364 Fuel-ups

  Property of humenfly

• 17.6 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 367 Fuel-ups

  Property of ssirik

• 14.9 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 446 Fuel-ups

  Property of Arctic388

• 16.3 Avg MPG

• GMC 1500 Crew

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2019 • 171 Fuel-ups

  Property of wingbase

• 11.8 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Nov 2019 • 84 Fuel-ups

  Property of Musang

• 15.0 Avg MPG

• GMC 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2019 • 168 Fuel-ups

  Property of slatejoh

• 15.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 373 Fuel-ups

  Property of Karels

• 16.8 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added May 2020 • 194 Fuel-ups

  Property of jurbin

• 15.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 287 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2023 • 61 Fuel-ups

  Property of Nholley

• 18.0 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 373 Fuel-ups

  Property of mnetland

• 18.6 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2023 • 34 Fuel-ups

  Property of Hetelle

• 15.6 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 371 Fuel-ups

  Property of jarrett85

• 15.3 Avg MPG

• GMC Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2020 • 125 Fuel-ups

  Property of Chuck16785

• 17.3 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 294 Fuel-ups

  Property of mnvik28

• 14.5 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 530 Fuel-ups

  Property of CStreff

• 18.1 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 300 Fuel-ups

  Property of dbowman711

• 15.8 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 36 Fuel-ups

  Property of jc5570

• 15.6 Avg MPG

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