Based on data from 207 vehicles, 20,356 fuel-ups and 5,962,048 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.78 with a 0.05 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (13) 5.3L V8 FLEX (45) 5.3L V8 GAS (104) 6.2L V8 GAS (41) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (24) Crew Cab Pickup (65) Any Submodel Base (14) Denali (36) SLE (60) SLT (93) Other (4)

Below you can see a distribution of the fuel-ups with 611 outliers (2.91%) removed.

Following shows the average MPG of each of the 207 vehicles in the system.

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• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 409 Fuel-ups

  Property of Arctic388

• 16.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 86 Fuel-ups

  Property of Clemsonfan15

• 16.1 Avg MPG

• Da Kon

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 41 Fuel-ups

  Property of Tclechner

• 16.8 Avg MPG

• GMC Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2020 • 69 Fuel-ups

  Property of Chuck16785

• 17.2 Avg MPG

• GMC Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Aug 2017 • 190 Fuel-ups

  Property of eddykc03

• 15.6 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 325 Fuel-ups

  Property of jarrett85

• 15.5 Avg MPG

• Gmc

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 206 Fuel-ups

  Property of StanIROCZ

• 16.3 Avg MPG

• Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2018 • 170 Fuel-ups

  Property of kbreyette

• 15.2 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Nov 2020 • 180 Fuel-ups

  Property of glennm66

• 14.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 339 Fuel-ups

  Property of CurtK

• 16.6 Avg MPG

• Sierra Z-71

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 292 Fuel-ups

  Property of acmurf1

• 17.2 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2019 • 284 Fuel-ups

  Property of McCartney

• 15.3 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 234 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 27 Fuel-ups

  Property of jc5570

• 15.8 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2015 • 319 Fuel-ups

  Property of peterv

• 13.5 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2019 • 114 Fuel-ups

  Property of Gmguy426

• 8.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2018 • 119 Fuel-ups

  Property of Hash59

• 17.5 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 231 Fuel-ups

  Property of bluez06

• 15.2 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 211 Fuel-ups

  Property of Shakora

• 13.9 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 248 Fuel-ups

  Property of MrFastcars

• 14.1 Avg MPG

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