Based on data from 220 vehicles, 23,625 fuel-ups and 6,878,163 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 (49) 5.3L V8 GAS (115) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (24) Crew Cab Pickup (68) Any Submodel Base (14) Denali (35) SLE (66) SLT (104) Other (1)

Below you can see a distribution of the fuel-ups with 1521 outliers (6.05%) removed.

Following shows the average MPG of each of the 220 vehicles in the system.

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• 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

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 8 Fuel-ups

  Property of SpedMan

• 11.1 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added May 2019 • 29 Fuel-ups

  Property of dkrutka24

• 14.8 Avg MPG

• Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 154 Fuel-ups

  Property of drmiket

• 15.9 Avg MPG

• Bertha (Traded)

  2015 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 187 Fuel-ups

  Property of AndieAnderson

• 15.6 Avg MPG

• 2015 GMC 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added May 2017 • 93 Fuel-ups

  Property of JackMrla

• 16.9 Avg MPG

• 2015 Sierra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Sep 2019 • 3 Fuel-ups

  Property of ilovemaui

• 14.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2016 • 165 Fuel-ups

  Property of deckep

• 16.9 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2018 • 24 Fuel-ups

  Property of GatorCowboy

• 15.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Sep 2015 • 160 Fuel-ups

  Property of savaytse66

• 16.2 Avg MPG

• 15 Sierra Z-71

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jul 2016 • 155 Fuel-ups

  Property of ajgeiman

• 16.2 Avg MPG

• Sierra

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2016 • 102 Fuel-ups

  Property of ottovanb

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2019 • 14 Fuel-ups

  Property of black_denali

• 15.5 Avg MPG

• Ricky’s Sierra

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Jul 2018 • 31 Fuel-ups

  Property of rickylford

• 16.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Oct 2017 • 267 Fuel-ups

  Property of shauntritz

• 10.9 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 71 Fuel-ups

  Property of texasdoc

• 17.1 Avg MPG

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