The term luxury vehicle is a marketing term for a vehicle that provides luxury in exchange for increased cost. The term suggests a vehicle with more equipment, performance or prestige — or other discretionary features — beyond necessity. Though widely used, the term is broad and highly variable and lacks standardized definition. The term can reflect a wide range of a vehicle's design or marketing features, including body type, construction, comfort, size, equipment content, technological innovation or brand image — provided at a higher level and at higher cost. A luxury vehicle is a relatively expensive vehicle which includes additional features designed to increase the comfort of the driver and passengers. Luxury vehicles usually place more emphasis on comfort, appearance, and amenities such as technological upgrades and higher quality materials than on performance, economy, or utility. Luxury vehicles are often built in smaller numbers than more affordable mass-market vehicles. Luxury vehicles include cars (sedan, coupe, hatchback, station wagon, roadster, etc.) and trucks, such as light pickup trucks or sport utility vehicles

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.