Based on data from 220 vehicles, 24,343 fuel-ups and 7,041,332 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 743 outliers (2.96%) 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 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Sep 2018 • 20 Fuel-ups

  Property of NJFF41

• 18.1 Avg MPG

• 2015 Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2016 • 246 Fuel-ups

  Property of civicsiracer06

• 13.9 Avg MPG

• Gmc Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 153 Fuel-ups

  Property of dphi201

• 16.5 Avg MPG

• The White Truck

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2018 • 5 Fuel-ups

  Property of nedrolls

• 15.4 Avg MPG

• My Truck

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jul 2018 • 457 Fuel-ups

  Property of arosin

• 17.4 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Nov 2017 • 42 Fuel-ups

  Property of nfoufas

• 16.1 Avg MPG

• Joe's Sierra 1500

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2015 • 129 Fuel-ups

  Property of GMCJoe

• 18.4 Avg MPG

• GMC Sierra Denali

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2015 • 138 Fuel-ups

  Property of Brady_SS

• 16.8 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 199 Fuel-ups

  Property of curtisa95

• 18.1 Avg MPG

• My Truck

  2015 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2018 • 411 Fuel-ups

  Property of arosin

• 17.4 Avg MPG

• GMC Sierra 1500 SLT

  2015 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2017 • 86 Fuel-ups

  Property of TheLazyC

• 14.9 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2018 • 34 Fuel-ups

  Property of KorCar1

• 18.1 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 53 Fuel-ups

  Property of Fastlane01

• 15.3 Avg MPG

• Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Nov 2024 • 94 Fuel-ups

  Property of Snafujg

• 15.7 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2017 • 37 Fuel-ups

  Property of Big_Bad_Wolfe

• 15.9 Avg MPG

• Big Black

  2015 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2015 • 107 Fuel-ups

  Property of uscoastie1

• 16.5 Avg MPG

• Blue truck

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2017 • 34 Fuel-ups

  Property of ZollieH77

• 12.2 Avg MPG

• 2015 GMC Sierra

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2016 • 210 Fuel-ups

  Property of jrulapaugh

• 12.3 Avg MPG

• My Sierra 1500

  2015 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2017 • 23 Fuel-ups

  Property of woodyoc

• 16.0 Avg MPG

• 2015 Sierra 5.3 Z71 with cap

  2015 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2016 • 10 Fuel-ups

  Property of hopkid

• 18.5 Avg MPG

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