Based on data from 222 vehicles, 24,005 fuel-ups and 6,982,671 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.75 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (14) 5.3L V8 FLEX (51) 5.3L V8 GAS (115) 6.2L V8 GAS (41) Any Body Style Extended Cab Pickup (24) Crew Cab Pickup (69) Any Submodel Base (14) Denali (35) SLE (68) SLT (104) Other (1)

Below you can see a distribution of the fuel-ups with 1548 outliers (6.06%) removed.

Following shows the average MPG of each of the 222 vehicles in the system.

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• ‘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

• 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

• 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

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