This piece of work lends insight on the world’s future energy chart by reporting an experimental based study on biofuels, particularly butanol, being utilized in diesel engines. A literature review is carried out in diesel engine combustion and emissions, as well as in butanol being used as a clean and regenerable fuel. Then, the experimental methodology is introduced, describing equipments and basic setup for the experiments performed in this research. Results from these experiments are reported and discussed in the following chapter, which lead to useful conclusions about butanol utilization in compression ignition engines. At the end, future research directions are recommended for more in-depth investigation in this field. Overall, the topic of this work is interesting, and the study well organized.