To those who drive behind diesel trucks, they know that these vehicles tend to be more slower moving and potentially smellier than other vehicles. Those who drive trucks know they are gasoline hogs (after all look at the weight they are hauling). They are a vital necessity for the US economy. The U.S. Environmental Protection Agency ( EPA) and the U.S. Department of Transportation today announced the first national standards to reduce greenhouse gas (GHG) emissions and improve fuel efficiency of heavy-duty trucks and buses. This comprehensive proposed national program is projected to reduce GHG emissions by nearly 250 million metric tons and save 500 million barrels of oil over the lives of the vehicles produced within the program’s first five years. Truck emissions have been going down for years but this is a major step forward.