Based on data from 35 vehicles, 2,334 fuel-ups and 636,443 miles of driving, the 2007 Hummer H3 gets a combined Avg MPG of 14.56 with a 0.09 MPG margin of error.

Any Engine Type 3.7L L5 GAS (26) GAS (1) L5 GAS (8) Any Body Style Sport Utility (7) Any Submodel Luxury (6) Adventure (6) Base (7) X (7) Other (9)

Below you can see a distribution of the fuel-ups with 243 outliers (9.43%) removed.

Following shows the average MPG of each of the 35 vehicles in the system.

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• My H3

  2007 Hummer H3 Luxury 3.7L L5 GAS Automatic 4 Speed
  Added Nov 2020 • 189 Fuel-ups

  Property of mjohnson90

• 11.6 Avg MPG

• Hercules

  2007 Hummer H3 Adventure 3.7L L5 GAS Automatic 4 Speed
  Added Aug 2020 • 148 Fuel-ups

  Property of BorgesBuilt

• 14.8 Avg MPG

• My H3

  2007 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added May 2021 • 107 Fuel-ups

  Property of Weeks

• 14.4 Avg MPG

• My H3

  2007 Hummer H3 Adventure 3.7L L5 GAS Automatic 4 Speed
  Added Oct 2023 • 3 Fuel-ups

  Property of Maybeeian

• 15.1 Avg MPG

• Yeti

  2007 Hummer H3 Adventure 3.7L L5 GAS Automatic 4 Speed Sport Utility
  Added Jul 2023 • 3 Fuel-ups

  Property of MysteryMachine

• 24.0 Avg MPG

• My H3

  2007 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Jun 2022 • 29 Fuel-ups

  Property of jimcdr

• 15.6 Avg MPG

• My H3

  2007 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Oct 2021 • 37 Fuel-ups

  Property of barry22

• 13.3 Avg MPG

• Hummer

  2007 Hummer H3 Luxury 3.7L L5 GAS Automatic 4 Speed Sport Utility
  Added Oct 2017 • 27 Fuel-ups

  Property of FSanchezC

• 12.5 Avg MPG

• My H3

  2007 Hummer H3 X 3.7L L5 GAS Automatic 4 Speed
  Added Jun 2017 • 54 Fuel-ups

  Property of manicrodder

• 10.0 Avg MPG

• Hummer

  2007 Hummer H3 Luxury 3.7L L5 GAS Automatic 4 Speed Sport Utility
  Added Mar 2018 • 11 Fuel-ups

  Property of tvande

• 17.9 Avg MPG

• Slick Black Beauty

  2007 Hummer H3 Luxury 3,7L L5 GAS Automatic 4 Speed Sport Utility
  Added Dec 2020 • 13 Fuel-ups

  Property of Chris96

• 14.7 Avg MPG

• My H3

  2007 Hummer H3 X 3.7L L5 GAS Automatic 4 Speed
  Added Dec 2019 • 7 Fuel-ups

  Property of hmmr

• 14.9 Avg MPG

• H3

  2007 Hummer H3 X 3.7L L5 GAS Automatic 4 Speed
  Added Jun 2016 • 44 Fuel-ups

  Property of archer3s

• 13.1 Avg MPG

• My H3

  2007 Hummer H3 3.7L L5 GAS Automatic 4 Speed
  Added Mar 2017 • 90 Fuel-ups

  Property of dbakeg00

• 15.6 Avg MPG

• Hummer

  2007 Hummer H3 3.7L L5 GAS Automatic 4 Speed Sport Utility
  Added Dec 2018 • 3 Fuel-ups

  Property of Jocham20

• 13.4 Avg MPG

• My H3

  2007 Hummer H3 X 3.7L L5 GAS Automatic 4 Speed
  Added Jan 2017 • 59 Fuel-ups

  Property of AshleyH3

• 12.4 Avg MPG

• Hummer - H3

  2007 Hummer H3 Adventure 3.7L L5 GAS Automatic 4 Speed
  Added May 2016 • 820 Fuel-ups

  Property of Dan3874

• 16.3 Avg MPG

• My H3

  2007 Hummer H3 X 3.7L L5 GAS Standard 5 Speed
  Added Jul 2017 • 87 Fuel-ups

  Property of Gianimadrid

• 16.6 Avg MPG

• My H3

  2007 Hummer H3 Luxury 3.7L L5 GAS Automatic 4 Speed
  Added Jul 2017 • 5 Fuel-ups

  Property of blakesSI

• 16.9 Avg MPG

• My H3

  2007 Hummer H3 Adventure 3.7L L5 GAS Automatic 4 Speed
  Added Sep 2016 • 31 Fuel-ups

  Property of JcRicker

• 16.3 Avg MPG

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