Diesel engines are more efficient. They get better mileage, produce more torque, and last much longer than a gasoline engine. They are also more expensive to build.
diesel is more efficient
It will depend upon the conditions. Under normal operating conditions a diesel engine is more efficient than a petrol engine.
Diesel engines are more efficient and do use less fuel, but they do not cost less than a petrol engine, they cost more. Diesel fuel also costs more. A diesel engine will however last longer.
Overall it is about 20%
Petrol is far more comustile compared to Diesel
Petrol engines are widely considered to be the most efficient of engines, because they are more refined than diesel. Since diesel is not completely refined, it cannot completely combust and so does not (in theory) produce as much energy per litre of fuel as a petrol engine. However, some diesel engines can be made to be much more efficient than petrol engines because they have a different type of fuel, and burn it in a different way. Petrol engines are widely considered to be the most efficient of engines, because they are more refined than diesel. Since diesel is not completely refined, it cannot completely combust and so does not (in theory) produce as much energy per litre of fuel as a petrol engine. However, some diesel engines can be made to be much more efficient than petrol engines because they have a different type of fuel, and burn it in a different way.
It's more a question of "different", than "better". Petrol engines can have better power-to-weight ratios, while diesels are a little more efficient.
diesel is usually more expensive but diesel cars usually have more mpg than petrol cars
Petrol is and bit more vicous and that diesel is a lot darker than petrol. Petrol burns quicker when set alight, however diesel burns more brightly!
diesel is more expensive
How many petrol diesel...What? More information is needed.
petrol has a lower flash point and is more volatile than diesel.