Based on data from 119 vehicles, 10,538 fuel-ups and 3,438,611 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 (87) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (24) Any Submodel Base (10) SLE (18) SLT (31) Denali (59) Other (1)

Below you can see a distribution of the fuel-ups with 153 outliers (1.43%) removed.

Following shows the average MPG of each of the 119 vehicles in the system.

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• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2021 • 88 Fuel-ups

  Property of natesmith16

• 17.3 Avg MPG

• GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2017 • 496 Fuel-ups

  Property of artywoof

• 9.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 280 Fuel-ups

  Property of rjkaoud

• 12.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2021 • 151 Fuel-ups

  Property of cibalibeb

• 12.6 Avg MPG

• GMC Truck

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 206 Fuel-ups

  Property of thevinman2

• 9.9 Avg MPG

• Moby

  2015 GMC Sierra 2500 HD 6.0L V8 GAS Automatic 6 Speed
  Added Mar 2025 • 3 Fuel-ups

  Property of Classicrocker81

• 11.2 Avg MPG

• Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 372 Fuel-ups

  Property of KTBHDH

• 12.1 Avg MPG

• El Caballo Negro

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 132 Fuel-ups

  Property of jpvilches86

• 17.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 196 Fuel-ups

  Property of hunter9312

• 16.5 Avg MPG

• GMC Sierra

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 114 Fuel-ups

  Property of ethanranft

• 11.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2024 • 16 Fuel-ups

  Property of vweatsvtec

• 10.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2024 • 32 Fuel-ups

  Property of chadlamb185

• 14.1 Avg MPG

• 2015 Duramax

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2024 • 13 Fuel-ups

  Property of reece650

• 14.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 316 Fuel-ups

  Property of dave012

• 13.7 Avg MPG

• Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2018 • 125 Fuel-ups

  Property of DooChess

• 15.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 418 Fuel-ups

  Property of DuramaxPoke

• 14.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2024 • 21 Fuel-ups

  Property of HOMEslice93

• 17.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2021 • 78 Fuel-ups

  Property of cdwarren

• 15.0 Avg MPG

• Big Blue

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2014 • 133 Fuel-ups

  Property of fightenfire

• 15.8 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 322 Fuel-ups

  Property of alibarle

• 14.7 Avg MPG

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