Based on data from 92 vehicles, 11,005 fuel-ups and 2,778,433 miles of driving, the 2008 GMC Sierra 2500 HD gets a combined Avg MPG of 14.28 with a 0.06 MPG margin of error.

Any Engine Type 6.0L V8 GAS (15) 6.6L V8 DIESEL (59) V8 DIESEL (9) V8 GAS (8) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (3) Crew Cab Pickup (19) Extended Crew Cab Pickup (2) Any Submodel WT (8) SLE (30) SLT (37) Other (17)

Below you can see a distribution of the fuel-ups with 488 outliers (4.25%) removed.

Following shows the average MPG of each of the 92 vehicles in the system.

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• Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 263 Fuel-ups

  Property of oilboi

• 14.4 Avg MPG

• GMC

  2008 GMC Sierra 2500 HD WT 6.0L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added May 2018 • 82 Fuel-ups

  Property of pisquidjay

• 12.7 Avg MPG

• GMC

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 521 Fuel-ups

  Property of knixon71

• 14.4 Avg MPG

• GMC Truck

  2008 GMC Sierra 2500 HD SLT 6.0L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Apr 2017 • 39 Fuel-ups

  Property of xmanjay

• 10.5 Avg MPG

• GMC Sierra 2500 HD SLE

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2019 • 26 Fuel-ups

  Property of jeffrey801

• 13.2 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added May 2017 • 97 Fuel-ups

  Property of dseabee

• 11.6 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2018 • 49 Fuel-ups

  Property of laner412

• 4.5 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2018 • 7 Fuel-ups

  Property of bsbbutts1

• 13.7 Avg MPG

• Sierra 2500HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 25 Fuel-ups

  Property of caldweke

• 16.1 Avg MPG

• Red

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jan 2019 • 33 Fuel-ups

  Property of tyman212

• 11.7 Avg MPG

• GMC Sierra 2500hd

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2018 • 17 Fuel-ups

  Property of TheKings

• 13.3 Avg MPG

• GMC Sierra

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 57 Fuel-ups

  Property of mansomd

• 12.5 Avg MPG

• BigRed

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jun 2018 • 8 Fuel-ups

  Property of obelisk

• 15.1 Avg MPG

• Bambi

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 185 Fuel-ups

  Property of stevecaddel

• 14.2 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Dec 2017 • 18 Fuel-ups

  Property of jrence6

• 13.8 Avg MPG

• Josh GMC Truck

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 630 Fuel-ups

  Property of fox454

• 15.9 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 3 Fuel-ups

  Property of jasonblunden

• 11.5 Avg MPG

• High oh sliver

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 8 Fuel-ups

  Property of JM138

• 17.2 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2017 • 12 Fuel-ups

  Property of lehdood

• 15.8 Avg MPG

• GMC

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 99 Fuel-ups

  Property of jvetterl

• 13.5 Avg MPG

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