According to the Department of Energy, test results shows that heating oil is more efficient than other fuels. In addition, heating oil is clean burning, safe and costs less than other energy sources. The fuel oil and coal industry is fulfilling the worlds insatiable requirement for energy, with the largest usage in North America, Asia and Europe. In fact, more than 90 percent of U.S. energy comes from these fossil fuels, which are pumped from the reserves that are present far underground.