how is fuel efficiency measured define the term
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That proportion of energy released by a fuel combustion process which is converted into useful work. For vehicles, it is measured in miles per gallon or kilometers per liter.
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The efficiency of a fuel is judged by its calorific value. Calorific value is the amount of heat produced on complete combustion of 1kg of fuel . It is expressed as KJ/ Kg ( kilojoules per kilogram) .
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