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| Energy efficiency in transportation ： ウィキペディア英語版 |
Energy efficiency in transportation
:''This page describes energy efficiency in means of transportation. For the environmental impact assessment of a given product or service throughout its lifespan, see life cycle assessment.''
The energy efficiency of different types of transportation ranges from some hundred kilojoules per kilometre for a bicycle to several megajoules for a helicopter.
== Units of measurement ==
Efficiency can be expressed in terms of:
* distance per vehicle per unit fuel volume (e.g. km/L or miles per gallon (US or imperial))
* distance per vehicle per unit fuel mass (e.g. km/kg)〔Aeroplane Efficiency, ''Fédération Aéronautique Internationale'', "FAI – The World Air Sports Federation"〕
* volume of fuel (or total energy) consumed per unit distance per vehicle (e.g. L/100 km or kW·h/100 km),
* volume of fuel (or total energy) consumed per unit distance per passenger (e.g. L/(100 passenger·km))
* volume of fuel (or total energy) consumed per unit distance per unit mass of cargo transported (e.g. L/100 kg·km or MJ/t·km).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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