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The fuel economy of an automobile is the fuel efficiency relationship between the distance traveled and the amount of fuel consumed by the vehicle. Consumption can be expressed in terms of volume of fuel to travel a distance, or the distance travelled per unit volume of fuel consumed. Since fuel consumption of vehicles is a significant factor in air pollution, and since importation of motor fuel can be a large part of a nation's foreign trade, many countries impose requirements for fuel economy. Different measurement cycles are used to approximate the actual performance of the vehicle. The energy in fuel is required to overcome various losses (wind resistance, tire drag, and others) in propelling the vehicle, and in providing power to vehicle systems such as ignition or air conditioning. Various measures can be taken to reduce losses at each of the conversions between chemical energy in fuel and kinetic energy of the vehicle. Driver behavior can affect fuel economy; maneuvers such as sudden acceleration and heavy braking waste energy. ==Units of measure== Fuel economy is the relationship between the distance traveled and fuel consumed. Fuel economy can be expressed in two ways: ;Units of fuel per fixed distance: Generally expressed as liters per 100 kilometers (L/100 km), used in most European countries, China, South Africa, Australia and New Zealand. British and Canadian law allow for the use of either liters per 100 kilometers or miles per imperial gallon.〔()〕〔(【引用サイトリンク】title=The Passenger Car (Fuel Consumption and CO2 Emissions Information) Regulations 2001 )〕 Recently, the window sticker on new US cars has started displaying the vehicle's fuel consumption in US gallons per 100 miles.〔(The New Fuel Economy Label ) at FuelEconomy.gov〕 ;Units of distance per fixed fuel unit: Miles per gallon (mpg) is commonly used in the United States, the United Kingdom, and Canada (alongside L/100 km). Kilometers per liter (km/L) is more commonly used elsewhere in the Americas, continental Europe, Asia, parts of Africa and Oceania. When the mpg unit is used, it is necessary to identify the type of gallon used, as the imperial gallon is 4.5 liters and the US gallon is 3.785 liters. Conversions of units: 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「Fuel economy in automobiles」の詳細全文を読む スポンサード リンク
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