Based on data from 110 vehicles, 9,245 fuel-ups and 3,004,583 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 (18) 6.0L V8 GAS (9) 6.6L V8 DIESEL (80) GAS (1) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (5) Crew Cab Pickup (23) Any Submodel Base (8) SLE (15) SLT (28) Denali (58) Other (1)

Below you can see a distribution of the fuel-ups with 122 outliers (1.30%) removed.

Following shows the average MPG of each of the 110 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 2020 • 55 Fuel-ups

  Property of ackerman12

• 13.7 Avg MPG

• 2500HD

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2022 • 13 Fuel-ups

  Property of dhinger1986

• 11.0 Avg MPG

• Big Blue

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added May 2014 • 111 Fuel-ups

  Property of fightenfire

• 16.0 Avg MPG

• Black Beauty

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Dec 2020 • 72 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 Dec 2021 • 51 Fuel-ups

  Property of natesmith16

• 17.5 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2018 • 141 Fuel-ups

  Property of henley0926

• 13.3 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2019 • 64 Fuel-ups

  Property of k1llswitch

• 14.1 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2021 • 54 Fuel-ups

  Property of cdwarren

• 15.3 Avg MPG

• GMC Denali HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 148 Fuel-ups

  Property of gbender2379

• 14.3 Avg MPG

• 2015 Sierra 2500

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2015 • 177 Fuel-ups

  Property of hemigoat2003

• 13.1 Avg MPG

• Sierra 2500 HD Denali

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2019 • 52 Fuel-ups

  Property of tlish1

• 13.8 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

• Duke

  2015 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2019 • 272 Fuel-ups

  Property of timsterd

• 12.1 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

• 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

• 2015 Truck

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2018 • 182 Fuel-ups

  Property of Wallnut61

• 13.9 Avg MPG

• My Sierra 2500 HD

  2015 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2021 • 35 Fuel-ups

  Property of rookiefire14

• 13.9 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 Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jul 2016 • 113 Fuel-ups

  Property of clnracing

• 14.9 Avg MPG

• Denali (22)

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

  Property of kingtek

• 13.2 Avg MPG

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