Based on data from 112 vehicles, 9,800 fuel-ups and 3,196,625 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 Jul 2018 • 81 Fuel-ups

  Property of dirtymax15

• 13.8 Avg MPG

• GMC Truck

  2015 GMC Sierra 2500 HD Denali 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 197 Fuel-ups

  Property of thevinman2

• 9.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2019 • 81 Fuel-ups

  Property of k1llswitch

• 13.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2021 • 92 Fuel-ups

  Property of hobby38y

• 14.9 Avg MPG

• 2015 Sierra 2500

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2015 • 180 Fuel-ups

  Property of hemigoat2003

• 13.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2021 • 3 Fuel-ups

  Property of blayrelily

• 36.5 Avg MPG

• 2015 Sierra 2500 HD Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 63 Fuel-ups

  Property of tlish1

• 14.2 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2023 • 38 Fuel-ups

  Property of dsmitty37

• 15.3 Avg MPG

• GMC Denali HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Apr 2023 • 165 Fuel-ups

  Property of gbender2379

• 14.2 Avg MPG

• Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2018 • 120 Fuel-ups

  Property of DooChess

• 15.5 Avg MPG

• My Sierra 2500 HD

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

  Property of mikeJonze

• 14.3 Avg MPG

• 2500HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2022 • 28 Fuel-ups

  Property of dhinger1986

• 10.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2015 • 353 Fuel-ups

  Property of flymhi

• 15.3 Avg MPG

• Sierra Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2020 • 69 Fuel-ups

  Property of MikeGes

• 12.3 Avg MPG

• Dmax Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2018 • 4 Fuel-ups

  Property of jwjost

• 43.0 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2023 • 10 Fuel-ups

  Property of esgutah78

• 11.7 Avg MPG

• Duke

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2019 • 273 Fuel-ups

  Property of timsterd

• 12.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Oct 2017 • 141 Fuel-ups

  Property of Funnyguy1045

• 10.2 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Apr 2023 • 8 Fuel-ups

  Property of yesubyllib

• 7.3 Avg MPG

• 2015 Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2023 • 231 Fuel-ups

  Property of OrangeMonza

• 14.5 Avg MPG

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