Scientists from Purdue University (United States) recently made a study on a local mass transit (bus) company to assess the impact of fuel switching from regular fuel (100% standard diesel, 0% biodiesel) to a 10% biodiesel blended fuel (B10) on bus operations. At the same time, the study also aimed to see if it was possible to obtain sustained benefits if the blend was increased from B10 to B20. The results of the study showed that the buses running on B10 blends have the potential to reduce pollution from the mass transit industry without sacrificing on fuel economy. An increase to B20 could also increase the benefits in savings in imported petroleum fuel and reduced carbon emissions. According to Purdue University researcher, Gregory Shaver, an increase to B20 would translate to (1) a savings of about 360,000 gallons per year in “foreign and non-renewable” energy sources, (2) a reduction in carbon dioxide and particulate emissions by 12% and (3) a reduction in unburned hydrocarbons by 20%. One anticipated drawback in the increase to B20 is the possible increase in nitrogen dioxide emissions. However, Shaver and his team are working to develop engines that can efficiently burn fuels with higher biodiesel blends, with the aim to reduce nitrogen dioxides and fuel consumption..