Based on data from 115 vehicles, 10,257 fuel-ups and 3,348,392 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 (18) 6.0L V8 GAS (9) 6.6L V8 DIESEL (85) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (24) Any Submodel Base (9) SLE (17) SLT (30) Denali (58) Other (1)

Below you can see a distribution of the fuel-ups with 140 outliers (1.35%) removed.

Following shows the average MPG of each of the 115 vehicles in the system.

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• 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

• 2015 Truck

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2018 • 33 Fuel-ups

  Property of JunkImpala

• 9.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 4 Fuel-ups

  Property of jimmyewilliams

• 9.1 Avg MPG

• 2500HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2015 • 166 Fuel-ups

  Property of rjhenry

• 12.5 Avg MPG

• Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2018 • 42 Fuel-ups

  Property of kbrooks17

• 13.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2016 • 200 Fuel-ups

  Property of btencer

• 11.5 Avg MPG

• GMC

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 59 Fuel-ups

  Property of tractor3E

• 15.0 Avg MPG

• Dirtymax

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 5 Fuel-ups

  Property of Tvan2194

• 13.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2019 • 3 Fuel-ups

  Property of wise707

• 14.2 Avg MPG

• 2015 Denali 2500

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 153 Fuel-ups

  Property of jesse828

• 11.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Crew Cab Pickup (4 Door)
  Added Aug 2015 • 85 Fuel-ups

  Property of Hachiroku86

• 15.6 Avg MPG

• Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Mar 2018 • 71 Fuel-ups

  Property of Cfransen1

• 11.7 Avg MPG

• GMC

  2015 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 77 Fuel-ups

  Property of beefington

• 15.4 Avg MPG

• 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

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