Based on data from 118 vehicles, 10,462 fuel-ups and 3,414,240 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 (87) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (24) Any Submodel Base (9) SLE (18) SLT (31) Denali (59) Other (1)

Below you can see a distribution of the fuel-ups with 151 outliers (1.42%) removed.

Following shows the average MPG of each of the 118 vehicles in the system.

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• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2024 • 10 Fuel-ups

  Property of vweatsvtec

• 10.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2024 • 19 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 Jul 2018 • 192 Fuel-ups

  Property of hunter9312

• 16.5 Avg MPG

• My Truck

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2020 • 557 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 May 2021 • 271 Fuel-ups

  Property of rjkaoud

• 12.2 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2019 • 310 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 Dec 2021 • 147 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 Mar 2019 • 319 Fuel-ups

  Property of alibarle

• 14.7 Avg MPG

• GMC Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2017 • 487 Fuel-ups

  Property of artywoof

• 9.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2023 • 55 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 • 128 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 • 413 Fuel-ups

  Property of DuramaxPoke

• 14.2 Avg MPG

• Truck

  2015 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Mar 2019 • 258 Fuel-ups

  Property of Chartley04

• 11.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added May 2018 • 51 Fuel-ups

  Property of sexterra23

• 10.7 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2024 • 27 Fuel-ups

  Property of chadlamb185

• 14.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2021 • 80 Fuel-ups

  Property of rookiefire14

• 14.4 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2019 • 105 Fuel-ups

  Property of k1llswitch

• 13.7 Avg MPG

• 2015 Sierra 2500

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2015 • 190 Fuel-ups

  Property of hemigoat2003

• 13.2 Avg MPG

• GMC Sierra

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 112 Fuel-ups

  Property of ethanranft

• 11.6 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2020 • 55 Fuel-ups

  Property of SnowRiderJ

• 10.1 Avg MPG

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