Fuel management in the United States is primarily under the purview of the Department of Energy (DOE). The DOE plays a crucial role in overseeing the nation's energy policy, including the management and regulation of fuel resources. This department is responsible for ensuring the efficient and sustainable use of fuels, such as oil, natural gas, and coal, which are vital for the country's energy security and economic stability.

The Department of Energy's involvement in fuel management is justified by several factors. Firstly, the DOE has the authority to regulate and oversee the extraction, production, and distribution of fuels. This is essential for maintaining a stable and reliable energy supply, as well as for addressing environmental concerns associated with fuel consumption. According to the U.S. Energy Information Administration (EIA), the DOE manages approximately 40% of the nation's oil and gas resources, which underscores its significant role in fuel management.

Secondly, the DOE is tasked with promoting energy efficiency and renewable energy sources, which are crucial for reducing the country's dependence on fossil fuels. By investing in research and development, the DOE supports the transition to cleaner and more sustainable energy options. For instance, the DOE's Office of Energy Efficiency and Renewable Energy (EERE) has allocated billions of dollars to advance renewable energy technologies, such as wind, solar, and bioenergy, which can help mitigate the environmental impact of fuel consumption.

Moreover, the DOE plays a critical role in international energy policy and trade. As the world's largest energy consumer, the United States relies on fuel imports to meet a significant portion of its energy needs. The DOE works to ensure that these imports are secure and that the country maintains a competitive advantage in global energy markets. This includes negotiating trade agreements, monitoring fuel prices, and supporting the development of domestic fuel resources.

In conclusion, the Department of Energy is the primary department responsible for fuel management in the United States. Its role is essential for ensuring energy security, promoting sustainability, and addressing environmental concerns. The DOE's authority to regulate fuel resources, invest in renewable energy, and engage in international energy policy underscores its importance in managing the nation's fuel supply.