Diesel is more than 33% more efficient than gasoline is
when it comes to your fuel mileage. However, diesel fuel does cost more than
gasoline, although it is usually within around 20 cents of the price of regular
gasoline.
Diesel needs to be run through a diesel engine, and diesel
engines offer more torque than a gasoline engine. Torque allows for great
acceleration, which also accounts for the great fuel economy numbers.
Diesel engines are typically louder than gasoline engines,
although technologies have been developed that have helped to limit this as
much as possible.
Diesel produces less carbon dioxide, but has been shown to
produce carcinogens, which can be just as harmful to the environment.
The diesel fuel and engine combination can produce better
engine performance, although this is lessened when the diesel use is
bio-diesel, or other forms of enhanced fuel such as black diesel.