The Air Force has nearly completed certification of its aircraft fleet on a 50-50 blend of synthetic and petroleum-based fuel, but the Defense Department's energy-purchasing office is concerned about being forced to buy the two fuels separately and then blend them organically, according to DOD energy officials. Speaking at an Army-Air Force energy forum in Arlington, VA, on July 19, Jeff Braun, the director of the Air Force's alternative fuel certification office, said that the service has certified 99 percent...
