Based on data from 115 vehicles, 10,307 fuel-ups and 3,363,525 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 139 outliers (1.33%) removed.

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

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• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added May 2018 • 47 Fuel-ups

  Property of sexterra23

• 10.7 Avg MPG

• GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2017 • 478 Fuel-ups

  Property of artywoof

• 9.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2024 • 24 Fuel-ups

  Property of chadlamb185

• 14.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 256 Fuel-ups

  Property of rjkaoud

• 12.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 303 Fuel-ups

  Property of dave012

• 13.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 309 Fuel-ups

  Property of alibarle

• 14.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 408 Fuel-ups

  Property of DuramaxPoke

• 14.2 Avg MPG

• 2015 Sierra 2500

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2015 • 187 Fuel-ups

  Property of hemigoat2003

• 13.2 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2024 • 15 Fuel-ups

  Property of HOMEslice93

• 17.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2021 • 75 Fuel-ups

  Property of rookiefire14

• 14.4 Avg MPG

• My Truck

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 544 Fuel-ups

  Property of MikeJ135

• 14.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2021 • 75 Fuel-ups

  Property of cdwarren

• 15.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2021 • 142 Fuel-ups

  Property of cibalibeb

• 12.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2023 • 54 Fuel-ups

  Property of dsmitty37

• 16.2 Avg MPG

• El Caballo Negro

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 125 Fuel-ups

  Property of jpvilches86

• 17.4 Avg MPG

• GMC Truck

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 202 Fuel-ups

  Property of thevinman2

• 9.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 187 Fuel-ups

  Property of hunter9312

• 16.5 Avg MPG

• Truck

  2015 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Mar 2019 • 255 Fuel-ups

  Property of Chartley04

• 11.3 Avg MPG

• My Blackie

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2024 • 3 Fuel-ups

  Property of esgutah78

• 15.2 Avg MPG

• Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2018 • 124 Fuel-ups

  Property of DooChess

• 15.6 Avg MPG

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