Based on data from 120 vehicles, 10,683 fuel-ups and 3,487,781 miles of driving, the 2015 GMC Sierra 2500 HD gets a combined Avg MPG of 13.13 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 (10) 6.6L V8 DIESEL (88) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (24) Any Submodel Base (10) SLE (18) SLT (32) Denali (59) Other (1)

Below you can see a distribution of the fuel-ups with 150 outliers (1.38%) removed.

Following shows the average MPG of each of the 120 vehicles in the system.

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• Sara

  2015 GMC Sierra 2500 HD 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 121 Fuel-ups

  Property of Madams1371

• 13.2 Avg MPG

• sierra

  2015 GMC Sierra 2500 HD 6.0L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Apr 2015 • 153 Fuel-ups

  Property of theiceman2448

• 11.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 2500 HD SLT 6.0L V8 GAS Automatic 6 Speed
  Added Sep 2019 • 128 Fuel-ups

  Property of WallyIAm

• 13.5 Avg MPG

• Sierra

  2015 GMC Sierra 2500 HD 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 75 Fuel-ups

  Property of staffordnath

• 12.2 Avg MPG

• 2018 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Jul 2018 • 12 Fuel-ups

  Property of SoundLine

• 11.9 Avg MPG

• 2015 Duramax Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 62 Fuel-ups

  Property of mnvik28

• 13.1 Avg MPG

• Earl

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 11 Fuel-ups

  Property of edaw

• 12.0 Avg MPG

• 2015 GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added May 2017 • 24 Fuel-ups

  Property of zxcv

• 11.6 Avg MPG

• Trojan 176

  2015 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Oct 2017 • 316 Fuel-ups

  Property of MixPix

• 10.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 11 Fuel-ups

  Property of mjakins

• 11.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 119 Fuel-ups

  Property of odenfire1819

• 14.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2015 • 92 Fuel-ups

  Property of pcloss

• 13.8 Avg MPG

• 2015 Sierra Denali HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 133 Fuel-ups

  Property of LynnE24

• 15.2 Avg MPG

• Sierra

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Mar 2017 • 38 Fuel-ups

  Property of SteveB27

• 14.3 Avg MPG

• MY15 Duramax

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 69 Fuel-ups

  Property of Mavis500

• 14.0 Avg MPG

• GMC

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2017 • 23 Fuel-ups

  Property of ipullen

• 16.7 Avg MPG

• Work Truck

  2015 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added May 2016 • 157 Fuel-ups

  Property of iblackwe

• 11.7 Avg MPG

• Duramax Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 66 Fuel-ups

  Property of jwsjr

• 14.2 Avg MPG

• 2015 Truck

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 80 Fuel-ups

  Property of ryankx250

• 14.9 Avg MPG

• 2015 Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2016 • 10 Fuel-ups

  Property of Hiestand88

• 14.4 Avg MPG

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