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Autogas is the common name for liquefied petroleum gas (LPG) when it is used as a fuel in internal combustion engines in vehicles as well as in stationary applications such as generators. It is a mixture of propane and butane. Autogas is widely used as a "green" fuel, as its use reduces exhaust emissions by around 15% compared to petrol. One litre of petrol produces 2.3 kg of when burnt, whereas the equivalent amount of autogas (1.33 litre due to lower density of autogas) produces only 1.5 * 1.33 = 2 kg of when burnt. It has an octane rating (MON/RON) that is between 90 and 110 and an energy content (higher heating value—HHV) that is between 25.5 megajoules per litre (for pure propane) and 28.7 megajoules per litre (for pure butane) depending upon the actual fuel composition. Autogas is the third most popular automotive fuel in the world, with approximately 16 million of 600 million passenger cars powered using the fuel, representing less than 3% of the total market share. Approximately half of all autogas-fueled passenger vehicles are in the five largest markets (in descending order): Turkey, South Korea, Poland, Italy, and Australia. ==Terminology variations== In countries where petroleum spirits is called ''petrol'' rather than ''gasoline'', it is common for autogas to be simply referred to as ''gas''. This can be confusing for people from countries where petrol is called ''gasoline'', as they often use ''gas'' as an abbreviation of gasoline. In the United States, autogas is more commonly known under the name of its primary constituent, ''propane''. In 2010 the Propane Education & Research Council adopted "Propane Autogas" to refer to LPG used in on-road motor vehicles.〔(【引用サイトリンク】title=Autogas )〕 In the UK ''LPG'' and ''autogas'' are used interchangeably. In Australia the common terms are ''LPG'' and ''gas''. In Italy and France, ''GPL'' (an acronym for ''gas di petrolio liquefatto'' and ''gaz de pétrole liquéfié'') is used. In Spain the term ''GLP'' (''gas licuado del petróleo'') is used. In Asian countries, particularly those with historical American influences, such as the Philippines, the term ''autogas'' is not commonly recognised as a generic term, and the use of the terms ''LPG'' or ''autoLPG'' is more widely used by consumers, especially by taxi drivers, many of whom use converted vehicles. The converted vehicles are commonly called ''LPG vehicles'' or ''LPG cars''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Autogas」の詳細全文を読む スポンサード リンク
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