Based on data from 220 vehicles, 23,746 fuel-ups and 6,911,922 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.76 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (14) 5.3L V8 FLEX (49) 5.3L V8 GAS (115) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (24) Crew Cab Pickup (68) Any Submodel Base (14) Denali (35) SLE (66) SLT (104) Other (1)

Below you can see a distribution of the fuel-ups with 1526 outliers (6.04%) removed.

Following shows the average MPG of each of the 220 vehicles in the system.

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• 2015 GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 313 Fuel-ups

  Property of bluez06

• 15.1 Avg MPG

• GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2021 • 438 Fuel-ups

  Property of jarrett85

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 117 Fuel-ups

  Property of Clemsonfan15

• 16.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2021 • 110 Fuel-ups

  Property of kyleiowa

• 16.0 Avg MPG

• GMC Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Aug 2017 • 260 Fuel-ups

  Property of eddykc03

• 15.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2023 • 125 Fuel-ups

  Property of Nholley

• 17.8 Avg MPG

• 2015 GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 350 Fuel-ups

  Property of mnvik28

• 14.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Nov 2019 • 111 Fuel-ups

  Property of Musang

• 15.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 385 Fuel-ups

  Property of dustin8201

• 14.5 Avg MPG

• My GMC 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2017 • 300 Fuel-ups

  Property of bjsgasdata

• 16.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed
  Added Dec 2024 • 29 Fuel-ups

  Property of mbishop62

• 13.2 Avg MPG

• BlueFishDogTooth III

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added May 2019 • 213 Fuel-ups

  Property of dennisp2938

• 13.3 Avg MPG

• 2015 GMC SIERRA CREW CAB

  2015 GMC Sierra 1500 SLT 6.2L GAS V8 Automatic 8 Crew Cab Pickup (4 Door)
  Added May 2015 • 160 Fuel-ups

  Property of Freeweeling

• 18.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 487 Fuel-ups

  Property of Karels

• 16.8 Avg MPG

• GMC 1500 SLT

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2019 • 243 Fuel-ups

  Property of slatejoh

• 14.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2023 • 80 Fuel-ups

  Property of Hetelle

• 15.3 Avg MPG

• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 400 Fuel-ups

  Property of humenfly

• 17.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2021 • 68 Fuel-ups

  Property of Colton1500

• 13.8 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed
  Added May 2020 • 119 Fuel-ups

  Property of richardmnagle

• 10.4 Avg MPG

• Joey's GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 271 Fuel-ups

  Property of Shakora

• 14.1 Avg MPG

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