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.

Auto Rental

An auto rental, rent-an-auto or auto hire agency is a company that rents automobiles for short periods of time (ranging from a few hours to a few weeks) for a fee. It is an elaborate form of a rental shop, organized in numerous local branches, primarily located near airports or busy city areas and often complemented by a website allowing online reservations. There are also third party websites (such as online travel agencies) which compare quotes from the major auto rental agencies. auto rental agencies primarily serve people who have a auto that is temporarily out of reach or out of service, for example travelers who are out of town or owners of damaged or destroyed vehicles who are awaiting repair or insurance compensation. Because of the variety of sizes of their vehicles, auto rental agencies may also serve the self-moving industry needs, by renting vans or trucks.

Auto rentals are subject to many conditions which vary from one brand to another. The vehicle must be returned in a good condition and must not exceed a maximum driven distance, otherwise extra fees may be incurred. Additionally, some companies set a minimum age for the vehicle driver, which in some cases is as high as 25, even in countries where the minimum legal age to hold a driver's license is much lower. Recent conditions have utilized GPS technology to limit maximum speeds or driving to specific regions. Renewable fuel vehicles are available in certain areas.

The vast majority of auto rental companies require the use of a Credit card to make it easier for them to trace a person after they have stolen a auto, or to charge additional fees at will if a defect is later found with the auto. There are two major types of auto hire companies. The first group of companies own their own autos (known as a fleet) and may have agreements with auto manufacturers to provide all the autos for that fleet. An example of this type of company would be Alamo or Europacar. The other type of auto hire company operate on a broker model and have commercial agreements with auto hire companies to provide access to their fleets of autos. To allow for a uniform classification and easy comparison of auto rental prices, the Association of auto Rental Industry Systems and Standards has developed the ACRISS_auto_Classification_Code coding system. This describes the size, dour count, gearbox type (manual/automatic) and whether the auto is air-conditioned in a short code.

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