Based on data from 110 vehicles, 9,247 fuel-ups and 3,005,166 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 (18) 6.0L V8 GAS (9) 6.6L V8 DIESEL (80) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (23) Any Submodel Base (8) SLE (15) SLT (28) Denali (58) Other (1)

Below you can see a distribution of the fuel-ups with 122 outliers (1.30%) removed.

Following shows the average MPG of each of the 110 vehicles in the system.

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• 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

• 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

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