The document discusses several case studies on the use of biodiesel blends in fleet vehicles, including a B20 bus fleet evaluation by NREL and the US Postal Service, a Cummins 1000 hour durability test of B20, and emissions studies on biodiesel use in vehicles operated by the North Carolina Department of Transportation. It also provides an overview of organizations in North Carolina that use biodiesel in their fleets, such as state agencies, the military, airports, private businesses, schools, and local governments. Resources on biodiesel use and technical information from the National Biodiesel Board are also referenced.