Based on data from 206 vehicles, 20,219 fuel-ups and 5,917,860 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.80 with a 0.05 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (13) 5.3L V8 FLEX (44) 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 (59) SLT (93) Other (4)

Below you can see a distribution of the fuel-ups with 614 outliers (2.95%) removed.

Following shows the average MPG of each of the 206 vehicles in the system.

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• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 215 Fuel-ups

  Property of Shakora

• 13.9 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Aug 2016 • 315 Fuel-ups

  Property of mnetland

• 18.6 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2018 • 243 Fuel-ups

  Property of mnvik28

• 14.5 Avg MPG

• Da Kon

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 45 Fuel-ups

  Property of Tclechner

• 16.7 Avg MPG

• GMC Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2020 • 73 Fuel-ups

  Property of Chuck16785

• 17.1 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 328 Fuel-ups

  Property of jarrett85

• 15.4 Avg MPG

• 2015 GMC Sierra Crew Cab

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 240 Fuel-ups

  Property of dbowman711

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 211 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 482 Fuel-ups

  Property of CStreff

• 18.1 Avg MPG

• Team Blue (Truck)

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2022 • 59 Fuel-ups

  Property of TeamBlue

• 16.2 Avg MPG

• Ali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Sep 2021 • 21 Fuel-ups

  Property of WPro

• 16.4 Avg MPG

• GMC 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2019 • 109 Fuel-ups

  Property of slatejoh

• 16.3 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 251 Fuel-ups

  Property of MrFastcars

• 14.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 257 Fuel-ups

  Property of dustin8201

• 14.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 275 Fuel-ups

  Property of Karels

• 17.0 Avg MPG

• Little Blue

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2022 • 26 Fuel-ups

  Property of psm11911

• 16.3 Avg MPG

• GMC 1500 Crew

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2019 • 117 Fuel-ups

  Property of wingbase

• 12.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 343 Fuel-ups

  Property of CurtK

• 16.6 Avg MPG

• Sierra All Terrain

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2015 • 194 Fuel-ups

  Property of Gilles

• 17.4 Avg MPG

• BlueFishDogTooth III

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2019 • 101 Fuel-ups

  Property of dennisp2938

• 12.7 Avg MPG

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