Based on data from 117 vehicles, 10,357 fuel-ups and 3,379,325 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 (9) 6.6L V8 DIESEL (86) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (24) Any Submodel Base (9) SLE (17) SLT (31) Denali (59) Other (1)

Below you can see a distribution of the fuel-ups with 139 outliers (1.32%) removed.

Following shows the average MPG of each of the 117 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 Jul 2018 • 190 Fuel-ups

  Property of hunter9312

• 16.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2021 • 77 Fuel-ups

  Property of rookiefire14

• 14.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2024 • 26 Fuel-ups

  Property of chadlamb185

• 14.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2024 • 17 Fuel-ups

  Property of HOMEslice93

• 17.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 263 Fuel-ups

  Property of rjkaoud

• 12.3 Avg MPG

• My Truck

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 550 Fuel-ups

  Property of MikeJ135

• 14.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added May 2018 • 49 Fuel-ups

  Property of sexterra23

• 10.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 314 Fuel-ups

  Property of alibarle

• 14.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 306 Fuel-ups

  Property of dave012

• 13.7 Avg MPG

• GMC Truck

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 204 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 Sep 2020 • 54 Fuel-ups

  Property of SnowRiderJ

• 10.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2024 • 4 Fuel-ups

  Property of vweatsvtec

• 10.4 Avg MPG

• El Caballo Negro

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 126 Fuel-ups

  Property of jpvilches86

• 17.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 410 Fuel-ups

  Property of DuramaxPoke

• 14.2 Avg MPG

• 2015 Duramax

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

  Property of reece650

• 27.3 Avg MPG

• GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2017 • 482 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 Dec 2021 • 144 Fuel-ups

  Property of cibalibeb

• 12.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2021 • 76 Fuel-ups

  Property of cdwarren

• 15.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2019 • 102 Fuel-ups

  Property of k1llswitch

• 13.7 Avg MPG

• Big Blue

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2014 • 131 Fuel-ups

  Property of fightenfire

• 15.8 Avg MPG

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