From Dale Wickell,
Your Guide to Trucks.
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Vans, pickup trucks, and SUVs that weigh more than 8,500 pounds gross vehicle weight are classified as heavy-duty vehicles. HUMMERs fall into that category (and one uses diesel fuel). Fuel economy regulations do not apply to them, but here are a few related facts:

2004 Hummer H1

• 6.5L turbo-diesel V-8.
  
• Fuel tank holds 25 gallons.
• Has a cruising range of 400 miles at an average of 30-40 mph over a hard surface and rolling terrain.
  
• That's 16 mpg.

2004 HUMMER H2 SUV

• Vortec 6000 6.0L V-8.
  
• Fuel tank holds 32 gallons.
  
• Cruising range of 310 miles at an average of 30-40 mph over a hard surface and rolling terrain.
  
• That's 9.6 mpg.

2004 HUMMER H2 SUT

• Vortec 6000 6.0L V-8.
  
• Fuel tank holds 32 gallons.
  
• No cruising range given.

Back to the 2004 SUV Mileage Comparison Index