Diesel is a type of fuel used in Diesel engines. It is heavier than regular unleaded gasoline and has a higher ignition point. Diesel is primarily derived from petroleum but is increasingly made from biological sources (biodiesel). Diesel engines are generally more fuel efficient and powerful than their unleaded gasoline counterparts, hence their use in military, construction, and heavy transportation equipment.
In June 2022, news reports indicated that the United States had only 8 weeks supply of diesel fuel remaining.