Vehicles running around New Haven, Connecticut are now fueled by 100 percent vegetable oil from Yale’s dining halls. New Haven Bus Service contracts with Yale to run its shuttle service. In 2004, said company President Dan Miley, Yale contacted him and “wanted to be pro-active” in cleaning up vehicle pollution. So he agreed to run his buses on ultra-low sulfur diesel, which cuts sulfur pollution from 500 parts per million to 15.