Based on data from 91 vehicles, 10,494 fuel-ups and 2,656,224 miles of driving, the 2008 GMC Sierra 2500 HD gets a combined Avg MPG of 14.30 with a 0.06 MPG margin of error.

Any Engine Type 6.0L V8 GAS (14) 6.6L V8 DIESEL (59) 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 475 outliers (4.33%) removed.

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

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• 2008 GMC

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2020 • 110 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 • 278 Fuel-ups

  Property of VigilanteOne

• 15.4 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2017 • 298 Fuel-ups

  Property of NohrZ71

• 12.3 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.0L V8 GAS Automatic 6 Speed
  Added Aug 2022 • 42 Fuel-ups

  Property of PaigeC

• 12.8 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2021 • 113 Fuel-ups

  Property of KHK1

• 13.4 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

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 10 Fuel-ups

  Property of gregcg

• 15.2 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2018 • 413 Fuel-ups

  Property of Nawem

• 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 • 67 Fuel-ups

  Property of jeff801

• 13.0 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2021 • 93 Fuel-ups

  Property of jasonandcourtney

• 13.1 Avg MPG

• GMC

  2008 GMC Sierra 2500 HD Z71 V8 DIESEL
  Added May 2020 • 92 Fuel-ups

  Property of PearHead

• 14.8 Avg MPG

• GMC 2500HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 260 Fuel-ups

  Property of LawMan02

• 14.9 Avg MPG

• Chris GMC Sierra 2500

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 602 Fuel-ups

  Property of cshotmix

• 15.6 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 8 Fuel-ups

  Property of johnnymac69

• 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 • 408 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 • 170 Fuel-ups

  Property of TheKings

• 16.1 Avg MPG

• Duramax

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2021 • 64 Fuel-ups

  Property of WatchSquid

• 15.3 Avg MPG

• Sierra

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2021 • 42 Fuel-ups

  Property of tibrin

• 11.5 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2021 • 74 Fuel-ups

  Property of Niftydura

• 15.1 Avg MPG

• 346-15

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2023 • 4 Fuel-ups

  Property of Brandon-Lawrence

• 5.2 Avg MPG

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