Based on data from 203 vehicles, 19,631 fuel-ups and 5,772,047 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.81 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 (103) 6.2L V8 GAS (39) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (23) Crew Cab Pickup (64) Any Submodel Base (14) Denali (35) SLE (58) SLT (93) Other (3)

Below you can see a distribution of the fuel-ups with 583 outliers (2.88%) removed.

Following shows the average MPG of each of the 203 vehicles in the system.

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• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 324 Fuel-ups

  Property of CurtK

• 16.6 Avg MPG

• My GMC 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2017 • 172 Fuel-ups

  Property of bjsgasdata

• 16.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2021 • 66 Fuel-ups

  Property of Rivera21

• 13.3 Avg MPG

• Gmc

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 198 Fuel-ups

  Property of StanIROCZ

• 16.3 Avg MPG

• Corys 2015 Seirra

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 243 Fuel-ups

  Property of MrFastcars

• 14.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 182 Fuel-ups

  Property of CaptAbrahamSmollett

• 15.3 Avg MPG

• Truck

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 338 Fuel-ups

  Property of Dukesask

• 14.9 Avg MPG

• 15 GMC Sierra 1500 Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 175 Fuel-ups

  Property of HoustonC

• 15.4 Avg MPG

• Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2018 • 153 Fuel-ups

  Property of kbreyette

• 15.3 Avg MPG

• GMC Truck

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2020 • 57 Fuel-ups

  Property of Chuck16785

• 17.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2018 • 115 Fuel-ups

  Property of Hash59

• 17.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2021 • 16 Fuel-ups

  Property of kyleiowa

• 16.0 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added May 2020 • 83 Fuel-ups

  Property of jurbin

• 16.2 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 268 Fuel-ups

  Property of ssirik

• 14.5 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Nov 2019 • 59 Fuel-ups

  Property of Musang

• 15.2 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 267 Fuel-ups

  Property of dgrule

• 16.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Oct 2017 • 203 Fuel-ups

  Property of rguerrer93

• 16.3 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2016 • 224 Fuel-ups

  Property of bluez06

• 15.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2015 • 398 Fuel-ups

  Property of Arctic388

• 16.4 Avg MPG

• Da Kon

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 22 Fuel-ups

  Property of Tclechner

• 16.9 Avg MPG

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