Bangkok, known in Thai as Krung Thep Maha Nakhon is the capital, largest urban area and primate city of Thailand. It was a small trading post at the mouth of the Chao Phraya River during the Ayutthaya Kingdom and came to the forefront of Thailand when it was given the status as the capital city in 1768 after the burning of Ayuthaya. However, the current Rattanakosin Kingdom didn't begin until 1782 when the capital was moved across the river after being sacked by the Burmese. The Rattanakosin capital is now more formally called "Phra Nakorn", pertaining to the ancient boundaries in the metropolis' core and the name Bangkok now incorporates the urban build-up since the 18th century which has its own public administration and governor. In the span of over two hundred years, Bangkok has been the political, social and economic center of not only Thailand but for much of South East Asia and Indochina as well. Its influence in the arts, politics, fashion, education, entertainment as well as being the business, financial and cultural center of Asia has given Bangkok the status of a global city. The city's mix of Thai, Chinese, Indian, Buddhist, Muslim and Western cultures combined with the driving force of the Thai economy makes it increasingly attractive to foreigners both for business and pleasure and has made the city one of the world's top tourist destinations. Bangkok is the world's 22nd largest city by population with approximately registered 8,160,522 residents (July 2007), but due to large unregistered influxes of migrants from the North East of Thailand and of many nations across Asia, the population of greater Bangkok is estimated at nearly 15 million people.

Gasoline Engines

Gasoline engines have the advantage over diesel in being lighter and able to work at higher rotational speeds and they are the usual choice for fitting in high-performance sports cars. Continuous development of gasoline engines for over a hundred years has produced improvements in efficiency and reduced pollution. The carburetor was used on nearly all road car engines until the 1980s but it was long realized better control of the fuel/air mixture could be achieved with fuel injection. Indirect fuel injection was first used in aircraft engines from 1909, in racing car engines from the 1930s, and road cars from the late 1950s.

Gasoline Direct Injection (GDI) is now starting to appear in production vehicles such as the 2007 BMW MINI. Exhaust gases are also cleaned up by fitting a catalytic converter into the exhaust system. Clean air legislation in many of the car industries most important markets has made both catalysts and fuel injection virtually universal fittings. Most modern gasoline engines are also capable of running with up to 15% ethanol mixed into the gasoline - older vehicles may have seals and hoses that can be harmed by ethanol. With a small amount of redesign, gasoline-powered vehicles can run on ethanol concentrations as high as 85%. 100% ethanol is used in some parts of the world (such as Brazil), but vehicles must be started on pure gasoline and switched over to ethanol once the engine is running. Most gasoline engines cars can also run on LPG with the addition of an LPG tank for fuel storage and carburetion modifications to add an LPG mixer. LPG produces fewer toxic emissions and is a popular fuel for fork lift trucks that have to operate inside buildings.