Sao Paulo

Sao Paulo is the largest city in Brazil, with its metropolitan area ranking among the largest urban areas in the world. The city is the capital of the State of São Paulo, the most populous Brazilian state. It is also the richest city of Brazil. The name means Saint Paul in Portuguese. São Paulo exerts global influence in commerce and finance as well as arts and entertainment. The city has many renowned landmarks. The Immigrant's Hostel greeted millions of immigrants as they came to Brazil in the late 19th and early 20th centuries. Paulista Avenue, in Downtown, is the most important financial center of the country and Latin America. The city is home to the São Paulo Stock Exchange (BOVESPA). São Paulo has been home to several of the tallest buildings in Brazil, including the Mirante do Vale Building. With an estimated population of 10,990,249 residents within an area of 1,523 square kilometres (588 sq mi), São Paulo is the most populous in Brazil, in South America and in the Southern hemisphere. The city also lies at the center of the heavily urbanized São Paulo metropolitan area, which, with an estimated 19,616,060 people in 2008 over 7,944 square kilometres (3,067.2 sq mi), is the largest metropolitan area in the nation. Depending on which definition is used for New York's metropolitan area, the São Paulo metropolitan area is ranked as either the second or third most populous in the Americas, just behind Mexico City,[8] and one of the largest metropolitan areas in the world.

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.