Diesel Emissions

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Diesel engines are heavier so a 2500 cc diesel engine will be heavier than a 2500 cc petrol engine because stronger parts are needed for their operation, this extra weight will reduce their performance levels. The turbo diesel engine will gain a higher percentage of the increase in horsepower but will not automatically become faster than a similar sized gasoline engine with a turbocharger offering the same amount of boost. Complexity is reduced in a diesel engine as there is no ignition system but this is not a total advantage as they can be noisy and may require frequent maintenance intervals when compared to a petrol engine. Diesel engines can pull or carry heavier loads for longer distances because they produce more torque. That would explain why most trucks, pickups and vehicles that transport large amounts of cargo or have a high towing capacity have diesel engines. A petrol engine is a faster engine than its diesel counterpart because they generally have more horsepower. So the 2500 cc petrol engine will cover the 1/4 mile in a faster time than a 2500 cc diesel engine and it will accelerate from a standstill to 60mph in a shorter time. A diesel engine produces a smaller amount of carbon monoxide in its exhaust gases but petrol is still considered to be a cleaner fuel as there is black soot and aerosols in the diesel exhaust gases. A diesel engine can offer some of the performance of the gasoline engine with the aid of a turbocharger. The engine retains all the advantages including better fuel economy than even smaller sized petrol engines and gains a significant increase in speed.
  Common rail technology has moved diesel engines closer to their gasoline counterparts not just in speed but in quietness and refinement but common rail is also used to improve the petrol engine.
  Although the diesel engine may seem like the better engine and it is if you want the vehicle for heavy duty work or commercial purposes, it is my opinion that the petrol engine is the better option if money is not an issue as this engine provides a better refined driving experience.
  There are very good diesel engines in some luxury models but the petrol versions usually out perform them when it comes down to the petrol vs. diesel debate. Yes, but you would be better off with a turbo due to the natural low end torque of the diesel engine. The turbo would give more power at the higher rpm were the diesel is weaker. Supercharging it would make the low end very powerful but the top end weak, think severe turbo lag in reverse.

http://www.howstuffworks.com/gasoline2.htm
Gasoline is made from crude oil. The crude oil pumped out of the ground is black liquid called petroleum. This liquid contains hydrocarbons, and the carbon atoms in crude oil link together in chains of different lengths. http://www.eia.gov/tools/faqs/faq.cfm?id=9&t=5

Why has diesel fuel been more expensive than gasoline?
On-highway diesel fuel prices have been higher than regular gasoline prices almost continuously since September 2004, a break from the historical pattern of diesel fuel prices usually being lower than gasoline prices except in cold winters when demand for heating oil pushed diesel fuel prices higher. The main reasons why diesel fuel prices have been higher than gasoline prices in recent years are: High worldwide demand for diesel fuel and other distillate fuel oils, especially in Europe, China, India, and the United States, and a tight global refining capacity available to meet demand during the period of high economic growth from 2002 to mid-2008. The transition to less polluting, lower-sulfur diesel fuels in the United States affected diesel fuel production and distribution costs. The Federal excise tax for on-highway diesel fuel of 24.4 cents/gallon is 6 cents per gallon higher the gasoline tax. http://www.wisegeek.com/why-is-diesel-fuel-more-expensive-than-gasoline.htm

Diesel fuel, the kind of fuel commonly used in commercial trucks, has not always...
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