from Charlestown SC to Afghanistan.
I tried looking up how much gas per hour a C-5 uses but came up (kinda) dry. I did find a 2007 study that said:
http://books.nap.edu/openbook.php?record_id=11837&page=87Our nation’s dependence on imported oil leaves it dangerously vulnerable to attack. A single well-designed attack on the petroleum infrastructure in the Middle East could send oil to well over $100 per barrel and devastate the world’s economy. Schultz and Woolsey (2005) analyzed this vulnerability in a paper entitled “The petroleum bomb.” As shown in Figure 1-1, the U.S. dependency on foreign oil is expected grow to 70 percent by 2025, and Figure 1-3
shows that the nonfighter aircraft in the Air Force inventory consume 69.9 percent (approximately 1.82 billion gal/yr) of DoD aviation fuel. From mid-2004 to mid-2006, the cost of jet fuel increased from approximately $1/gal to $2.53/gal, a significant extra cost burden. These two key factors led to the creation of the Assured Fuels Initiative in the Office of the Secretary of Defense (OSD).
Then this puppy showed up:
http://www.fas.org/programs/ssp/man/uswpns/air/cargo/c5galaxy.htmlFour turbofan engines mounted on pylons under the wings power the C-5. Each engine pod is nearly 27 feet (8.2 meters) long, weighs 7,900 pounds (3,555 kilograms) and has an air intake diameter of more than 8 1/2 feet (2.6 meters). The Galaxy has 12 integral wing tanks with a capacity of 51,150 gallons (194,370 liters) of fuel - enough to fill 6 1/2 regular-size railroad tank cars. The fuel weighs 322,500 pounds (145,125 kilograms) and permits the C-5, carrying a 204,904-pound (92,207-kilogram) payload, to fly 2,150 nautical miles (3,440 kilometers), off-load, and fly another 500 miles (800 kilometers) without aerial refueling.
So basically 51,150 gallons of fuel will get you about 1/3 of the way to Afghanistan.
on edit: changed C-117 to C-17 in message title.