Based on data from 215 vehicles, 22,982 fuel-ups and 6,661,240 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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• The Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Apr 2016 • 32 Fuel-ups

  Property of kenrobertson

• 14.9 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L FLEX V8 Automatic 6
  Added Jun 2015 • 151 Fuel-ups

  Property of jp1170

• 17.1 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 93 Fuel-ups

  Property of Ottoball

• 16.3 Avg MPG

• GMC Sierra 1500 Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 49 Fuel-ups

  Property of jsiarto

• 15.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2015 • 77 Fuel-ups

  Property of Pitch

• 16.5 Avg MPG

• Vincent

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Nov 2015 • 21 Fuel-ups

  Property of awboxes

• 15.6 Avg MPG

• Bronze All-Terrain DC

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jul 2015 • 16 Fuel-ups

  Property of GWXDoubleAT

• 16.6 Avg MPG

• HIGHSIERRA

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2015 • 39 Fuel-ups

  Property of PTOWNcommuter

• 18.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2015 • 47 Fuel-ups

  Property of Pimm1975

• 13.9 Avg MPG

• GMC 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 20 Fuel-ups

  Property of T-rex1221

• 16.5 Avg MPG

• 2015 SLT Crew

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2015 • 15 Fuel-ups

  Property of bgillette79

• 16.6 Avg MPG

• ryansgmc

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Mar 2016 • 3 Fuel-ups

  Property of gmcryan

• 15.9 Avg MPG

• 2015 Sierra 1500 4X4

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Jan 2015 • 24 Fuel-ups

  Property of eastcoasthd

• 16.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2015 • 19 Fuel-ups

  Property of swethog

• 15.2 Avg MPG

• Otis

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jan 2016 • 5 Fuel-ups

  Property of True_North

• 16.1 Avg MPG

• DadsGMC

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jan 2016 • 4 Fuel-ups

  Property of mechanicaladvantage

• 17.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2016 • 3 Fuel-ups

  Property of jrfuelmiser

• 16.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2015 • 10 Fuel-ups

  Property of 2015Sierra62

• 17.0 Avg MPG

• Sierra 6.2L

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2015 • 38 Fuel-ups

  Property of WyGuy

• 18.3 Avg MPG

• My Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2015 • 8 Fuel-ups

  Property of Ubersteiny

• 15.7 Avg MPG

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