Based on data from 112 vehicles, 9,797 fuel-ups and 3,195,563 miles of driving, the 2015 GMC Sierra 2500 HD gets a combined Avg MPG of 13.12 with a 0.07 MPG margin of error.

Any Engine Type 6.0L V8 CNG (2) 6.0L V8 FLEX (19) 6.0L V8 GAS (9) 6.6L V8 DIESEL (81) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (23) Any Submodel Base (8) SLE (15) SLT (29) Denali (59) Other (1)

Below you can see a distribution of the fuel-ups with 123 outliers (1.24%) removed.

Following shows the average MPG of each of the 112 vehicles in the system.

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• 2015 Truck

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2018 • 182 Fuel-ups

  Property of Wallnut61

• 13.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2016 • 113 Fuel-ups

  Property of clnracing

• 14.9 Avg MPG

• Denali (22)

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2021 • 70 Fuel-ups

  Property of kingtek

• 13.2 Avg MPG

• Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2019 • 91 Fuel-ups

  Property of Bluewaterworth

• 12.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 48 Fuel-ups

  Property of Dodge1167

• 16.0 Avg MPG

• La Bete

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Sep 2021 • 3 Fuel-ups

  Property of Boo2u2

• 18.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added May 2021 • 12 Fuel-ups

  Property of reedsj94

• 15.9 Avg MPG

• 2015 GMC

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 188 Fuel-ups

  Property of Dentil

• 13.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2020 • 72 Fuel-ups

  Property of CaddoCreek

• 16.3 Avg MPG

• Brienne

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Sep 2019 • 54 Fuel-ups

  Property of Nitsua98

• 11.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2020 • 35 Fuel-ups

  Property of Mlperry

• 12.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2019 • 5 Fuel-ups

  Property of robby9074

• 18.9 Avg MPG

• Sierra Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 160 Fuel-ups

  Property of rivcoinc

• 13.4 Avg MPG

• Denali HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Apr 2015 • 149 Fuel-ups

  Property of CHR3

• 14.8 Avg MPG

• Denali HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2017 • 190 Fuel-ups

  Property of DenaliDad

• 13.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 5 Fuel-ups

  Property of ThatguyRoy

• 11.8 Avg MPG

• GMC

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2017 • 127 Fuel-ups

  Property of smtyler

• 13.4 Avg MPG

• Dirty Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2019 • 38 Fuel-ups

  Property of WalterWerks

• 14.1 Avg MPG

• GMC Truck

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Dec 2020 • 197 Fuel-ups

  Property of terriblecow

• 12.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.0L V8 GAS Automatic 6 Speed
  Added Oct 2017 • 134 Fuel-ups

  Property of cort424

• 11.4 Avg MPG

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