Based on data from 91 vehicles, 10,407 fuel-ups and 2,640,856 miles of driving, the 2008 GMC Sierra 2500 HD gets a combined Avg MPG of 14.31 with a 0.06 MPG margin of error.

Any Engine Type 6.0L V8 GAS (13) 6.6L V8 DIESEL (60) V8 DIESEL (9) V8 GAS (8) Any Body Style Standard Cab Pickup (1) Extended Cab Pickup (4) Crew Cab Pickup (19) Extended Crew Cab Pickup (2) Any Submodel WT (8) SLE (30) SLT (36) Other (17)

Below you can see a distribution of the fuel-ups with 470 outliers (4.32%) removed.

Following shows the average MPG of each of the 91 vehicles in the system.

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• 2008 Duramax

  2008 GMC Sierra 2500 HD SLT 6.6L DIESEL V8 Automatic 6 Extended Cab Pickup (4 Door)
  Added Apr 2015 • 967 Fuel-ups

  Property of RobBryce

• 14.3 Avg MPG

• 2008 GMC Sierra 2500 HD SLE

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Extended Crew Cab Pickup
  Added Jun 2019 • 65 Fuel-ups

  Property of jeff801

• 13.1 Avg MPG

• Joe's Truck

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jul 2022 • 4 Fuel-ups

  Property of allonthefarm

• 15.3 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2017 • 272 Fuel-ups

  Property of VigilanteOne

• 15.4 Avg MPG

• Rick's p/u

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Sep 2021 • 12 Fuel-ups

  Property of rebreininger

• 12.4 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2020 • 153 Fuel-ups

  Property of Chuck_Yager

• 13.6 Avg MPG

• GMC Utility

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Sep 2017 • 276 Fuel-ups

  Property of Cbrgary

• 12.8 Avg MPG

• White truck.

  2008 GMC Sierra 2500 HD WT 6.0L V8 GAS Automatic 6 Speed Standard Cab Pickup
  Added Sep 2021 • 8 Fuel-ups

  Property of justynkirchner

• 12.8 Avg MPG

• Truck

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 78 Fuel-ups

  Property of ssm04

• 12.1 Avg MPG

• White P/U

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL
  Added Feb 2019 • 257 Fuel-ups

  Property of rbreininger

• 14.4 Avg MPG

• GMC

  2008 GMC Sierra 2500 HD DIESEL V8
  Added Jan 2014 • 6 Fuel-ups

  Property of RhondaT

• 17.3 Avg MPG

• Duramax

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 18 Fuel-ups

  Property of wcaldridge

• 23.0 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2017 • 138 Fuel-ups

  Property of timmy123456

• 15.4 Avg MPG

• GMC pickup

  2008 GMC Sierra 2500 HD DIESEL V8
  Added Apr 2013 • 343 Fuel-ups

  Property of ATTACKLLAMA

• 15.3 Avg MPG

• Gmc 2500

  2008 GMC Sierra 2500 HD SLT Automatic 6 Speed
  Added Sep 2019 • 311 Fuel-ups

  Property of tphillipsjr3145

• 16.3 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Feb 2016 • 21 Fuel-ups

  Property of grumpy81

• 12.5 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2017 • 127 Fuel-ups

  Property of wilrob

• 16.3 Avg MPG

• 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

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