Based on data from 82 vehicles, 9,250 fuel-ups and 2,398,186 miles of driving, the 2008 GMC Sierra 2500 HD gets a combined Avg MPG of 14.28 with a 0.07 MPG margin of error.

Any Engine Type 6.0L V8 GAS (14) 6.6L V8 DIESEL (50) V8 DIESEL (9) V8 GAS (8) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (19) Extended Crew Cab Pickup (2) Any Submodel WT (6) SLE (28) SLT (31) Other (17)

Below you can see a distribution of the fuel-ups with 442 outliers (4.56%) removed.

Following shows the average MPG of each of the 82 vehicles in the system.

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• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2017 • 132 Fuel-ups

  Property of timmy123456

• 15.5 Avg MPG

• White P/U

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL
  Added Feb 2019 • 217 Fuel-ups

  Property of rbreininger

• 14.8 Avg MPG

• Chris GMC Sierra 2500

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 485 Fuel-ups

  Property of cshotmix

• 15.5 Avg MPG

• 2008 GMC

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2020 • 45 Fuel-ups

  Property of Maverick99

• 16.5 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2017 • 206 Fuel-ups

  Property of VigilanteOne

• 15.0 Avg MPG

• Truck

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 35 Fuel-ups

  Property of ssm04

• 12.3 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2017 • 187 Fuel-ups

  Property of NohrZ71

• 12.4 Avg MPG

• GMC 2500HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 168 Fuel-ups

  Property of LawMan02

• 15.8 Avg MPG

• Monster Gray

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Apr 2011 • 345 Fuel-ups

  Property of HarrisQ

• 13.4 Avg MPG

• GMC Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 94 Fuel-ups

  Property of TheKings

• 16.2 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2018 • 196 Fuel-ups

  Property of Nawem

• 14.2 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2020 • 34 Fuel-ups

  Property of Chuck_Yager

• 13.9 Avg MPG

• GMC Utility

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Extended Cab Pickup
  Added Sep 2017 • 258 Fuel-ups

  Property of Cbrgary

• 13.0 Avg MPG

• GMD 2500HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2010 • 264 Fuel-ups

  Property of gsxrah

• 16.4 Avg MPG

• 2008 Duramax

  2008 GMC Sierra 2500 HD SLT 6.6L DIESEL V8 Automatic 6 Extended Cab Pickup (4 Door)
  Added Apr 2015 • 907 Fuel-ups

  Property of RobBryce

• 14.1 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 • 43 Fuel-ups

  Property of jeff801

• 13.1 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

  2008 GMC Sierra 2500 HD Z71 V8 DIESEL
  Added May 2020 • 23 Fuel-ups

  Property of PearHead

• 14.4 Avg MPG

• 2008 GMC

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2016 • 591 Fuel-ups

  Property of gabrielleh

• 13.5 Avg MPG

• Gmc Sierra 2008

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 36 Fuel-ups

  Property of eeb01

• 14.5 Avg MPG

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