Based on data from 108 vehicles, 7,821 fuel-ups and 2,508,029 miles of driving, the 2015 GMC Sierra 2500 HD gets a combined Avg MPG of 12.95 with a 0.08 MPG margin of error.

Any Engine Type 6.0L V8 CNG (2) 6.0L V8 FLEX (20) 6.0L V8 GAS (10) 6.6L V8 DIESEL (75) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (4) Crew Cab Pickup (22) Any Submodel Base (8) SLE (16) SLT (28) Denali (55) Other (1)

Below you can see a distribution of the fuel-ups with 108 outliers (1.36%) removed.

Following shows the average MPG of each of the 108 vehicles in the system.

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• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 259 Fuel-ups

  Property of DuramaxPoke

• 13.3 Avg MPG

• GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2017 • 307 Fuel-ups

  Property of artywoof

• 9.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 131 Fuel-ups

  Property of alibarle

• 14.8 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 44 Fuel-ups

  Property of hunter9312

• 16.2 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added May 2018 • 31 Fuel-ups

  Property of sexterra23

• 11.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2015 • 253 Fuel-ups

  Property of flymhi

• 15.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 138 Fuel-ups

  Property of dave012

• 13.8 Avg MPG

• Sierra Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2020 • 51 Fuel-ups

  Property of MikeGes

• 12.5 Avg MPG

• Black Beauty

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Dec 2020 • 25 Fuel-ups

  Property of mschweizer68

• 15.6 Avg MPG

• Black Betty

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 42 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 Dec 2018 • 92 Fuel-ups

  Property of henley0926

• 13.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 72 Fuel-ups

  Property of rjkaoud

• 12.6 Avg MPG

• Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 220 Fuel-ups

  Property of KTBHDH

• 11.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 39 Fuel-ups

  Property of Dodge1167

• 16.1 Avg MPG

• GMC Truck

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 146 Fuel-ups

  Property of thevinman2

• 10.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Jul 2021 • 15 Fuel-ups

  Property of DrBob772000

• 16.1 Avg MPG

• BSE1

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2021 • 53 Fuel-ups

  Property of kingtek

• 13.6 Avg MPG

• My Truck

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 344 Fuel-ups

  Property of MikeJ135

• 14.3 Avg MPG

• Truck

  2015 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Mar 2019 • 165 Fuel-ups

  Property of Chartley04

• 11.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2021 • 10 Fuel-ups

  Property of rookiefire14

• 13.3 Avg MPG

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