In comparison to other transportation fuels like gasoline, diesel has a higher energy density and therefore provides more energy per gallon. Gasoline typically has an energy content of around 31.7 MJ/L (8,500 BTU/gal), which means diesel fuel contains about 13% more energy by volume.
The relatively high energy density of diesel fuel makes it particularly well-suited for applications where energy efficiency and long-range operation are important, such as heavy-duty trucks, buses, ships, and generators. While diesel engines tend to be less efficient than gasoline engines, the higher energy density of the fuel compensates for this difference, resulting in similar or even better overall fuel economy in certain applications.
However, it's worth noting that while diesel fuel provides substantial energy output, it also has negative environmental impacts, including the emission of pollutants and greenhouse gases such as carbon dioxide (CO2), nitrogen oxides (NOx), and particulate matter. As a result, there is an ongoing push towards adopting more sustainable and environmentally friendly fuel sources and transportation technologies.