Based on data from 215 vehicles, 22,942 fuel-ups and 6,649,565 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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• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2015 • 263 Fuel-ups

  Property of glangham

• 17.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2024 • 100 Fuel-ups

  Property of Strandman76

• 15.0 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2024 • 100 Fuel-ups

  Property of Strandman76

• 15.0 Avg MPG

• Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2018 • 202 Fuel-ups

  Property of kbreyette

• 15.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2022 • 18 Fuel-ups

  Property of jdonoho

• 15.6 Avg MPG

• Little Blue

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2022 • 42 Fuel-ups

  Property of psm11911

• 17.0 Avg MPG

• Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2019 • 126 Fuel-ups

  Property of Gmguy426

• 8.4 Avg MPG

• SIERRA

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2022 • 58 Fuel-ups

  Property of steven540i

• 17.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2022 • 56 Fuel-ups

  Property of amumcgann

• 18.1 Avg MPG

• SIERRA

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added Jun 2020 • 58 Fuel-ups

  Property of steven540i

• 17.3 Avg MPG

• 2015 GMC SIERRA CREW CAB TOWING

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2015 • 58 Fuel-ups

  Property of Freeweeling

• 14.1 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 291 Fuel-ups

  Property of dgrule

• 16.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2022 • 7 Fuel-ups

  Property of abby1127

• 17.9 Avg MPG

• GMC Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2020 • 23 Fuel-ups

  Property of KeeBlitz

• 18.7 Avg MPG

• '15 GMC Seirra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jul 2019 • 64 Fuel-ups

  Property of danny_coggins

• 15.7 Avg MPG

• Sierra 1500 Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Apr 2018 • 250 Fuel-ups

  Property of reety82

• 16.8 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2019 • 88 Fuel-ups

  Property of Christofo

• 15.8 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2020 • 28 Fuel-ups

  Property of frontrunner76

• 18.4 Avg MPG

• GMC Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2019 • 51 Fuel-ups

  Property of Gears_Gadgets

• 14.5 Avg MPG

• '15 GMC

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 262 Fuel-ups

  Property of 2kwik4u

• 16.0 Avg MPG

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