Based on data from 215 vehicles, 22,956 fuel-ups and 6,653,793 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 V8 GAS Automatic 6 Speed
  Added Sep 2017 • 177 Fuel-ups

  Property of tystebbins

• 13.8 Avg MPG

• X My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Aug 2019 • 17 Fuel-ups

  Property of JTD-3SV

• 14.9 Avg MPG

• GMC Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added Feb 2019 • 102 Fuel-ups

  Property of Grizzy

• 17.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Jan 2020 • 31 Fuel-ups

  Property of MJewell

• 16.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2018 • 143 Fuel-ups

  Property of cust0mbuild

• 11.8 Avg MPG

• Mad Max

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2019 • 41 Fuel-ups

  Property of gmzdad

• 16.5 Avg MPG

• Z

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2019 • 33 Fuel-ups

  Property of dex10

• 14.9 Avg MPG

• Onyx

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Aug 2015 • 296 Fuel-ups

  Property of 92teg92

• 14.2 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Sep 2016 • 271 Fuel-ups

  Property of crpntrmstr

• 14.7 Avg MPG

• 2015 Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added May 2018 • 66 Fuel-ups

  Property of gksills

• 17.0 Avg MPG

• Sierra Denali 2015

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Jun 2018 • 121 Fuel-ups

  Property of ivertiz

• 15.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2015 • 161 Fuel-ups

  Property of natterbe

• 18.5 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2015 • 104 Fuel-ups

  Property of chevyryan

• 17.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2019 • 22 Fuel-ups

  Property of trackingwild

• 16.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2020 • 4 Fuel-ups

  Property of mcs1960

• 14.1 Avg MPG

• 2015 GMC SIERRA

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2023 • 313 Fuel-ups

  Property of Morts

• 15.0 Avg MPG

• 2015 GMC SIERRA

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 313 Fuel-ups

  Property of Morts

• 15.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2018 • 45 Fuel-ups

  Property of aardwolf

• 16.2 Avg MPG

• My GMC Sierra

  2015 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Jun 2016 • 309 Fuel-ups

  Property of TheStepChild

• 21.9 Avg MPG

• 2015 Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2015 • 216 Fuel-ups

  Property of browley

• 16.4 Avg MPG

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