Based on data from 220 vehicles, 24,304 fuel-ups and 7,031,035 miles of driving, the 2015 GMC Sierra 1500 gets a combined Avg MPG of 15.69 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 739 outliers (2.95%) removed.

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

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• Silver Surfer

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2016 • 397 Fuel-ups

  Property of humenfly

• 17.4 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Oct 2017 • 235 Fuel-ups

  Property of rguerrer93

• 15.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 114 Fuel-ups

  Property of Clemsonfan15

• 16.0 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2015 • 347 Fuel-ups

  Property of peterv

• 13.7 Avg MPG

• GMC

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2017 • 297 Fuel-ups

  Property of dfrazier

• 15.9 Avg MPG

• 2015 GMC

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2024 • 4 Fuel-ups

  Property of Jdethington

• 15.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2022 • 68 Fuel-ups

  Property of beckstein1964

• 14.9 Avg MPG

• GMC 1500 Crew

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2019 • 180 Fuel-ups

  Property of wingbase

• 11.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2024 • 3 Fuel-ups

  Property of MikeZed164

• 37.9 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2021 • 52 Fuel-ups

  Property of macbot2000

• 12.2 Avg MPG

• Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added May 2020 • 204 Fuel-ups

  Property of jurbin

• 15.8 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2015 • 264 Fuel-ups

  Property of glangham

• 17.5 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Aug 2016 • 287 Fuel-ups

  Property of Mike1ch

• 13.2 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 23 Fuel-ups

  Property of IceYeti7

• 13.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Nov 2020 • 242 Fuel-ups

  Property of glennm66

• 14.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 541 Fuel-ups

  Property of CStreff

• 18.0 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 376 Fuel-ups

  Property of ssirik

• 14.9 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 223 Fuel-ups

  Property of akrutzler

• 15.5 Avg MPG

• ‘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

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