Hong Kong is the Hong Kong Special Administrative Region is a territory located on China's south coast on the Pearl River Delta, and borders Guangdong province in the north and faces the South China Sea in the east, west and south. It has a population of 6.9 million people, and is one of the most densely populated areas in the world. Beginning as a trading port, Hong Kong became a dependent territory of the United Kingdom in 1842, and remained so until the transfer of its sovereignty to the People's Republic of China in 1997. Along with Macau, Hong Kong is one of two special administrative regions and is generally not considered as part of mainland China. Under the "one country, two systems" policy, Hong Kong has a high degree of autonomy, is largely self-governing, and maintains a highly capitalist economy. Renowned for its expansive skyline and natural setting, Hong Kong is one of the world's leading financial capitals and a major business and cultural hub. Its identity as a cosmopolitan centre where east meets west is reflected in its cuisine, cinema, music and traditions, and although the population is predominantly Chinese, residents and expatriates of other ethnicities form a small but significant segment of society.

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.