Based on data from 215 vehicles, 22,997 fuel-ups and 6,665,659 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 Sierra Z71 6.2

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2015 • 39 Fuel-ups

  Property of KonaJack

• 18.8 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 18 Fuel-ups

  Property of Bandit33x

• 16.2 Avg MPG

• Diamond

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2015 • 5 Fuel-ups

  Property of dsbegay

• 28.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Sep 2015 • 15 Fuel-ups

  Property of randywine

• 18.8 Avg MPG

• Grey

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Sep 2015 • 9 Fuel-ups

  Property of condrasek1514

• 16.0 Avg MPG

• All Terrain

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 7 Fuel-ups

  Property of Paradoxjr

• 18.5 Avg MPG

• 15sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Crew Cab Pickup (4 Door)
  Added Jun 2015 • 14 Fuel-ups

  Property of tdidirtbag

• 17.6 Avg MPG

• 15Sierre

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 3 Fuel-ups

  Property of 05retro

• 19.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 6.2L GAS V8 Automatic 8 Crew Cab Pickup (4 Door)
  Added Mar 2015 • 23 Fuel-ups

  Property of brockalocka

• 18.8 Avg MPG

• Sierra SLE DC 4x4

  2015 GMC Sierra 1500 SLE 5.3L GAS V8 Automatic 6
  Added Feb 2015 • 28 Fuel-ups

  Property of ember1205

• 16.7 Avg MPG

• Rented XTS

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 4 Fuel-ups

  Property of jrulapaugh

• 22.6 Avg MPG

• 6.2L Denali

  2015 GMC Sierra 1500 Denali 6.2L GAS V8 Automatic 8 Crew Cab Pickup (4 Door)
  Added Mar 2015 • 3 Fuel-ups

  Property of bfalke1

• 14.9 Avg MPG

• Sierra SLE Max Tow

  2015 GMC Sierra 1500 SLE 5.3L GAS V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Dec 2014 • 7 Fuel-ups

  Property of GasInTheTank

• 18.6 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L GAS V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Jan 2015 • 3 Fuel-ups

  Property of windward_coug

• 17.1 Avg MPG

• GMC Denali

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2016 • 423 Fuel-ups

  Property of kpwaterdoc

• 9.9 Avg MPG

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