Diesel cars get higher MPGs and tend to be more reliable. However, petrol cars tend to be cheaper both in the short term and long term. If you are regular driver who doesn't make very long trips often, a petrol car would be fine.
It depends on what your needs are: if you want to get better mileage get a diesel or hybrid petrol car - but they cost more to buy than regular cars that run on unleaded. Though diesel fuel is more...
Depends on where you live, the price difference between both, the purpose of your vehicle, and how much you drive and where. For example you would want diesel engine for a truck or an offroad vehicle...
Diesel cars/trucks are more costly because of the design of the engine. The compression ratio (the pressure in the cylinders that make the power) is 8 or 9 to 1 for gas vehicles and 15 to 1 for...