The new HRJ fuel comes from the carmelina plant, which is a weed-like plant that isn’t used for food and requires little water. According to Alternative Fuels Certification officials, both the refining process and the emissions from HRJ biofuel are cleaner than those of conventional jet fuel.
The Air Force is trying to switch half of its US jet fuel requirements over to alternative fuel by 2016. They’re also trying to get all of their planes certified to fly using alternative fuels by 2012. As you probably guessed, the Air Force is the largest user of jet fuel in the Department of Defense – using 2.4 billion gallons per year. Next up this year are more tests with other aircraft – the F-15 Eagle, F-22 Raptor, and the C-17 Globemaster III.