Based on data from 95 vehicles, 11,332 fuel-ups and 2,857,623 miles of driving, the 2008 GMC Sierra 2500 HD gets a combined Avg MPG of 14.25 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 505 outliers (4.27%) removed.

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

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• 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

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 21 Fuel-ups

  Property of thorracin1

• 14.4 Avg MPG

• GMC

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Aug 2014 • 74 Fuel-ups

  Property of cdelaune05

• 14.2 Avg MPG

• 2008 GMC Sierra

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 147 Fuel-ups

  Property of 17BabyMax

• 12.3 Avg MPG

• GMC Sierra Kenneth

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Mar 2017 • 28 Fuel-ups

  Property of duhlink

• 14.1 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2017 • 13 Fuel-ups

  Property of laner045

• 12.9 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Apr 2017 • 7 Fuel-ups

  Property of korbyn

• 10.5 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD WT 6.0L V8 GAS Automatic 6 Speed
  Added Dec 2016 • 10 Fuel-ups

  Property of revoracer

• 9.8 Avg MPG

• 2008 GMC Sierra

  2008 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 750 Fuel-ups

  Property of crjones

• 14.4 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 8 Fuel-ups

  Property of AJH11

• 15.7 Avg MPG

• GMC 2500

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 370 Fuel-ups

  Property of brizgislawrencej

• 15.8 Avg MPG

• Sierra

  2008 GMC Sierra 2500 HD WT 6.0L V8 GAS Automatic 6 Speed
  Added Oct 2016 • 3 Fuel-ups

  Property of slanted

• 18.9 Avg MPG

• Josh truck

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 460 Fuel-ups

  Property of fox454

• 16.0 Avg MPG

• My Sierra 2500 HD

  2008 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2016 • 4 Fuel-ups

  Property of dzimbric

• 18.0 Avg MPG

• Truck

  2008 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed Extended Crew Cab Pickup
  Added Feb 2016 • 10 Fuel-ups

  Property of Cruiser60

• 12.7 Avg MPG

• hunter

  2008 GMC Sierra 2500 HD SLE 6.6L DIESEL V8 Automatic 6 Cab & Chassis (4 Door)
  Added Nov 2014 • 60 Fuel-ups

  Property of mernka1

• 14.1 Avg MPG

• Our GMC 4x4

  2008 GMC Sierra 2500 HD GAS V8
  Added Dec 2012 • 50 Fuel-ups

  Property of MountainPeople

• 11.2 Avg MPG

• daily driver

  2008 GMC Sierra 2500 HD SLT 6.6L DIESEL V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Sep 2014 • 8 Fuel-ups

  Property of mrbones

• 18.4 Avg MPG

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