Based on data from 95 vehicles, 11,518 fuel-ups and 2,898,992 miles of driving, the 2008 GMC Sierra 2500 HD gets a combined Avg MPG of 14.23 with a 0.06 MPG margin of error.

Any Engine Type 6.0L V8 GAS (15) 6.6L V8 DIESEL (62) 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 (31) SLT (39) Other (17)

Below you can see a distribution of the fuel-ups with 516 outliers (4.29%) removed.

Following shows the average MPG of each of the 95 vehicles in the system.

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• Sierra

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2021 • 78 Fuel-ups

  Property of tibrin

• 11.9 Avg MPG

• Duramax

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2021 • 157 Fuel-ups

  Property of WatchSquid

• 15.2 Avg MPG

• Chris GMC Sierra 2500

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 673 Fuel-ups

  Property of cshotmix

• 15.6 Avg MPG

• 2008 GMC

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2020 • 143 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 Apr 2017 • 381 Fuel-ups

  Property of NohrZ71

• 12.2 Avg MPG

• 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2024 • 11 Fuel-ups

  Property of Modtechteam

• 12.3 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2021 • 205 Fuel-ups

  Property of jasonandcourtney

• 13.4 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2024 • 30 Fuel-ups

  Property of Erick85

• 15.3 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2023 • 18 Fuel-ups

  Property of gregcg

• 14.1 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Sep 2023 • 37 Fuel-ups

  Property of HaydenH1996

• 11.1 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD WT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2018 • 585 Fuel-ups

  Property of Nawem

• 13.8 Avg MPG

• 346-15

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2023 • 23 Fuel-ups

  Property of Brandon-Lawrence

• 6.3 Avg MPG

• GMC 2500HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 284 Fuel-ups

  Property of LawMan02

• 14.7 Avg MPG

• Monster Gray

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Apr 2011 • 467 Fuel-ups

  Property of HarrisQ

• 13.5 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.0L V8 GAS Automatic 6 Speed
  Added Aug 2022 • 72 Fuel-ups

  Property of PaigeC

• 12.6 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 • 178 Fuel-ups

  Property of TheKings

• 16.6 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2021 • 115 Fuel-ups

  Property of Niftydura

• 15.0 Avg MPG

• 08 GMC TRUCK

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2022 • 96 Fuel-ups

  Property of denkerb

• 13.7 Avg MPG

• 08 Sierra 2500HD LMM

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2021 • 177 Fuel-ups

  Property of KHK1

• 13.2 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 • 83 Fuel-ups

  Property of jeff801

• 12.9 Avg MPG

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