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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• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 38 Fuel-ups

  Property of jc5570

• 15.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2020 • 45 Fuel-ups

  Property of Selway

• 16.8 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added May 2020 • 79 Fuel-ups

  Property of richardmnagle

• 10.9 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 456 Fuel-ups

  Property of Arctic388

• 16.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Jul 2023 • 17 Fuel-ups

  Property of bowiesbesthick

• 14.7 Avg MPG

• Sierra Z-71

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 327 Fuel-ups

  Property of acmurf1

• 17.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2021 • 50 Fuel-ups

  Property of Colton1500

• 13.7 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Nov 2020 • 242 Fuel-ups

  Property of glennm66

• 14.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 541 Fuel-ups

  Property of CStreff

• 18.0 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 376 Fuel-ups

  Property of ssirik

• 14.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 223 Fuel-ups

  Property of akrutzler

• 15.5 Avg MPG

• ‘15 GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2023 • 4 Fuel-ups

  Property of macleoddickey

• 16.9 Avg MPG

• Da Kon

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 89 Fuel-ups

  Property of Tclechner

• 16.1 Avg MPG

• Truck

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jan 2023 • 14 Fuel-ups

  Property of fernwoodnation

• 15.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2023 • 6 Fuel-ups

  Property of Rjoyce

• 15.3 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Aug 2020 • 239 Fuel-ups

  Property of DougT2008

• 14.4 Avg MPG

• Sierra 1500 - Veronica

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Sep 2023 • 310 Fuel-ups

  Property of McCartney

• 15.4 Avg MPG

• Sierra 1500 - Veronica

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2019 • 310 Fuel-ups

  Property of McCartney

• 15.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2021 • 106 Fuel-ups

  Property of Rivera21

• 13.5 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2019 • 131 Fuel-ups

  Property of BlackWatch62

• 15.6 Avg MPG

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