Boise, Idaho Fire Department: The Department has used B20 for almost three years in 14 fire engines and 2 trucks.  While all their fire engines are kept inside heated bays, due to winter temperatures that often drop to well below freezing at night and even days, they "start cold, run hard, and are put away hot," according to Battalion Chief Bruce Rankin.  "It made sense to use biodiesel for a number of social and practical reasons such as increased lubricity, reduced emissions and support of domestic farming.  When we were at an emergency scene, the exhaust used to be heavy in the area.  We were looking for any way to reduce harmful emissions and biodiesel is a great way to do that. Added benefits are that it's domestically produced and reduces our dependence on foreign oil."