Based on data from 215 vehicles, 22,979 fuel-ups and 6,660,488 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.71 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 (112) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (25) Crew Cab Pickup (66) Any Submodel Base (14) Denali (35) SLE (63) SLT (102) Other (1)

Below you can see a distribution of the fuel-ups with 718 outliers (3.03%) removed.

Following shows the average MPG of each of the 215 vehicles in the system.

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• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L GAS V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Jan 2015 • 44 Fuel-ups

  Property of mcnewskie

• 15.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Oct 2015 • 44 Fuel-ups

  Property of JBE7

• 18.4 Avg MPG

• Sierra 2015

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 66 Fuel-ups

  Property of sanity

• 14.4 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 5 Fuel-ups

  Property of iIsrael007

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2017 • 8 Fuel-ups

  Property of Mazatlan

• 15.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2016 • 15 Fuel-ups

  Property of Michaelhoover77

• 18.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2017 • 5 Fuel-ups

  Property of cameronGMC

• 14.1 Avg MPG

• SilverBrick

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2017 • 50 Fuel-ups

  Property of SilverBrick

• 17.2 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 23 Fuel-ups

  Property of Clemsonfan15

• 16.2 Avg MPG

• GMC Sierra

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

  Property of ehaus82

• 13.2 Avg MPG

• All Terrain

  2015 GMC Sierra 1500 All Terrain
  Added Mar 2017 • 96 Fuel-ups

  Property of sappermiller

• 15.2 Avg MPG

• Steve

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Aug 2015 • 29 Fuel-ups

  Property of jdru66

• 16.7 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Extended Cab Pickup
  Added Apr 2018 • 50 Fuel-ups

  Property of marino454

• 16.0 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2015 • 62 Fuel-ups

  Property of jraschke11

• 15.4 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2015 • 54 Fuel-ups

  Property of tdb729

• 14.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L GAS V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Apr 2015 • 97 Fuel-ups

  Property of viabuho

• 17.2 Avg MPG

• SilverBullet

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jun 2016 • 9 Fuel-ups

  Property of Buhada

• 12.9 Avg MPG

• 2015 Sierra

  2015 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Feb 2016 • 38 Fuel-ups

  Property of trentm

• 15.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2015 • 42 Fuel-ups

  Property of hydrashok1911

• 17.6 Avg MPG

• Big Sexy

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2016 • 14 Fuel-ups

  Property of BigSexyAT

• 12.7 Avg MPG

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