Based on data from 215 vehicles, 22,975 fuel-ups and 6,659,201 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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• 2015 GMC 1500 SLE

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2016 • 783 Fuel-ups

  Property of kpwaterdoc

• 13.3 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Feb 2016 • 20 Fuel-ups

  Property of mrmicrochip

• 9.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Nov 2016 • 138 Fuel-ups

  Property of rahman20k

• 19.0 Avg MPG

• Sierra '15

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 131 Fuel-ups

  Property of karldv

• 14.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2016 • 60 Fuel-ups

  Property of Bitten70

• 14.9 Avg MPG

• Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2017 • 61 Fuel-ups

  Property of sappermiller

• 16.4 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 110 Fuel-ups

  Property of starnix59

• 18.6 Avg MPG

• Sierra4x4, It Tows Stuff

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Sep 2015 • 32 Fuel-ups

  Property of LowbanksArcher

• 16.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 19 Fuel-ups

  Property of miniozzy3

• 17.1 Avg MPG

• Stone Blue Denali

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2014 • 88 Fuel-ups

  Property of Digger3

• 18.9 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2015 • 144 Fuel-ups

  Property of Qbert

• 17.3 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Apr 2018 • 117 Fuel-ups

  Property of mitchellalger

• 18.7 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 162 Fuel-ups

  Property of dbball

• 17.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Dec 2016 • 57 Fuel-ups

  Property of Paul303

• 17.6 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2017 • 79 Fuel-ups

  Property of barfieldcr

• 17.6 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2017 • 3 Fuel-ups

  Property of troy1999

• 16.4 Avg MPG

• Phoenix Sierra 1500

  2015 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Mar 2017 • 20 Fuel-ups

  Property of RKTfuel

• 15.7 Avg MPG

• Hank

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Aug 2015 • 53 Fuel-ups

  Property of sslowpoke

• 18.8 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2017 • 17 Fuel-ups

  Property of rumsontrader

• 10.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2016 • 27 Fuel-ups

  Property of edwardwjq

• 18.2 Avg MPG

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