It has higher energy density, higher flash point (less prone to fire or explosion), less volatile (doesn't evaporate as quickly), and less toxic. However, it's

It has higher energy density, higher flash point (less prone to fire or explosion), less volatile (doesn't evaporate as quickly), and less toxic. However, it's difficult to make a diesel that gets as much power/weight or power/volume as a comparable petrol engine. There are trade-offs. It's not a universally superior fuel.