Here is a section taken from this link:http://www.autotrader.co.uk/CARS/buying/diesel_or_petrol.jspDiesel is becoming more popular, due to its efficiency benefits over petrol and its lower CO2 emissions.Pros:• Stays in each gear longer, helping with acceleration and reducing the need for gear changing• High engine efficiency• Lower CO2 emissions• Some high performance fuels are available in dieselCons:• Diesel engines are louder than their petrol counterparts• Results in a less smooth ride• More expensive than petrol by a couple of pence• Higher Nitrogen Oxide (an air pollutant) emissions than petrol