Based on data from 112 vehicles, 9,797 fuel-ups and 3,195,563 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 (19) 6.0L V8 GAS (9) 6.6L V8 DIESEL (81) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (23) Any Submodel Base (8) SLE (15) SLT (29) Denali (59) Other (1)

Below you can see a distribution of the fuel-ups with 123 outliers (1.24%) removed.

Following shows the average MPG of each of the 112 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 Jun 2021 • 55 Fuel-ups

  Property of rookiefire14

• 14.3 Avg MPG

• My Truck

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 493 Fuel-ups

  Property of MikeJ135

• 13.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 277 Fuel-ups

  Property of alibarle

• 14.8 Avg MPG

• Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 342 Fuel-ups

  Property of KTBHDH

• 12.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2020 • 71 Fuel-ups

  Property of ackerman12

• 14.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added May 2018 • 26 Fuel-ups

  Property of sexterra23

• 10.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 261 Fuel-ups

  Property of dave012

• 13.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2021 • 105 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 Jul 2018 • 178 Fuel-ups

  Property of hunter9312

• 16.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 379 Fuel-ups

  Property of DuramaxPoke

• 13.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 48 Fuel-ups

  Property of SnowRiderJ

• 10.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 223 Fuel-ups

  Property of rjkaoud

• 12.3 Avg MPG

• GMC Sierra

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 102 Fuel-ups

  Property of ethanranft

• 11.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2021 • 70 Fuel-ups

  Property of cdwarren

• 15.4 Avg MPG

• GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2017 • 437 Fuel-ups

  Property of artywoof

• 9.4 Avg MPG

• My Sierra 2500 HD

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

  Property of natesmith16

• 17.5 Avg MPG

• Truck

  2015 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Mar 2019 • 230 Fuel-ups

  Property of Chartley04

• 11.4 Avg MPG

• Big Blue

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2014 • 123 Fuel-ups

  Property of fightenfire

• 15.9 Avg MPG

• Black Beauty

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Dec 2020 • 83 Fuel-ups

  Property of mschweizer68

• 16.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2018 • 81 Fuel-ups

  Property of dirtymax15

• 13.8 Avg MPG

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