Based on data from 207 vehicles, 20,328 fuel-ups and 5,953,886 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.78 with a 0.05 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (13) 5.3L V8 FLEX (45) 5.3L V8 GAS (104) 6.2L V8 GAS (41) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (24) Crew Cab Pickup (65) Any Submodel Base (14) Denali (36) SLE (60) SLT (93) Other (4)

Below you can see a distribution of the fuel-ups with 611 outliers (2.92%) removed.

Following shows the average MPG of each of the 207 vehicles in the system.

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• Big Black

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2015 • 107 Fuel-ups

  Property of uscoastie1

• 16.5 Avg MPG

• Blue truck

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2017 • 34 Fuel-ups

  Property of ZollieH77

• 12.2 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 210 Fuel-ups

  Property of jrulapaugh

• 12.3 Avg MPG

• My Sierra 1500

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

  Property of woodyoc

• 16.0 Avg MPG

• 2015 Sierra 5.3 Z71 with cap

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2016 • 10 Fuel-ups

  Property of hopkid

• 18.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2017 • 24 Fuel-ups

  Property of brennans

• 17.4 Avg MPG

• Z. Stella

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 62 Fuel-ups

  Property of Mtnboarder

• 16.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2016 • 122 Fuel-ups

  Property of Roadwarrior32

• 16.6 Avg MPG

• GMC Sierra 1500

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

  Property of rodflowers8888

• 18.7 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Sep 2017 • 11 Fuel-ups

  Property of kpmerritt

• 16.1 Avg MPG

• 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

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