Based on data from 30 vehicles, 1,673 fuel-ups and 370,533 miles of driving, the 2008 Hummer H3 gets a combined Avg MPG of 13.76 with a 0.08 MPG margin of error.

Any Engine Type 3.7L L5 GAS (9) 5.3L V8 GAS (11) L5 GAS (7) V8 GAS (2) Any Body Style Sport Utility (6) Any Submodel X (1) Adventure (1) Luxury (2) Base (5) Alpha (11) Other (10)

Below you can see a distribution of the fuel-ups with 37 outliers (2.16%) removed.

Following shows the average MPG of each of the 30 vehicles in the system.

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• Hummer H3

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2022 • 69 Fuel-ups

  Property of Loren03

• 12.7 Avg MPG

• My H3

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Feb 2025 • 6 Fuel-ups

  Property of SteakBubble

• 11.9 Avg MPG

• + 2008 Hummer H3

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed Sport Utility
  Added Sep 2022 • 14 Fuel-ups

  Property of EchuOkan1

• 10.1 Avg MPG

• Brutus

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed Sport Utility
  Added Feb 2017 • 712 Fuel-ups

  Property of jsandler

• 13.9 Avg MPG

• H3 Alpha

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Jun 2018 • 190 Fuel-ups

  Property of Dan3874

• 12.7 Avg MPG

• My H3

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Jan 2019 • 67 Fuel-ups

  Property of Blaketruett

• 13.1 Avg MPG

• My H3

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Feb 2020 • 5 Fuel-ups

  Property of johnrig35

• 14.2 Avg MPG

• Hummer H3

  2008 Hummer H3 Luxury 3.7L L5 GAS Automatic 4 Speed Sport Utility
  Added Oct 2017 • 55 Fuel-ups

  Property of kacie0311

• 15.2 Avg MPG

• My H3

  2008 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Jun 2019 • 12 Fuel-ups

  Property of jhoblue1987

• 14.1 Avg MPG

• My H3

  2008 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Apr 2019 • 8 Fuel-ups

  Property of bschm306

• 16.2 Avg MPG

• Hummer

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 121 Fuel-ups

  Property of edona4

• 15.3 Avg MPG

• H3 Alpha

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed Sport Utility
  Added Feb 2019 • 11 Fuel-ups

  Property of WizardofGunMonkeys

• 13.5 Avg MPG

• Sammi

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed Sport Utility
  Added May 2018 • 7 Fuel-ups

  Property of HMVWNAB

• 14.1 Avg MPG

• H3

  2008 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Mar 2017 • 37 Fuel-ups

  Property of bnang9

• 15.9 Avg MPG

• My H3

  2008 Hummer H3 Adventure 3.7L L5 GAS Automatic 4 Speed
  Added Jan 2018 • 3 Fuel-ups

  Property of Brettm70

• 11.7 Avg MPG

• H3

  2008 Hummer H3 X 3.7L L5 GAS Automatic 4 Speed Sport Utility
  Added Sep 2012 • 276 Fuel-ups

  Property of nshummer

• 14.5 Avg MPG

• My H3

  2008 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Dec 2016 • 20 Fuel-ups

  Property of DaBigDumbBear

• 14.3 Avg MPG

• Hummer

  2008 Hummer H3 Alpha 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 41 Fuel-ups

  Property of edona4

• 18.7 Avg MPG

• My H3

  2008 Hummer H3 Luxury 3.7L L5 GAS Automatic 4 Speed
  Added Jul 2016 • 3 Fuel-ups

  Property of jjquito

• 14.6 Avg MPG

• Sharknado

  2008 Hummer H3 3.7L L5 GAS Automatic 4
  Added Aug 2015 • 29 Fuel-ups

  Property of JoshBear

• 12.8 Avg MPG

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