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...]] of a particular vehicle, given as a [[ratio]] of distance traveled per unit of [[Motor fuel|fuel]] consumed. It is dependent on several factors includ ...chive-date= 2013-07-05 }}</ref> Weight-specific efficiency (efficiency per unit weight) may be stated for [[freight]], and passenger-specific efficiency (v ...

...nits of one type of energy. Emergy is measured in units of ''emjoule''s, a unit referring to the available energy consumed in transformations. Emergy accou In 1975, he introduced a table of "Energy Quality Factors", kilocalories of sunlight energy required to ma ...