Question

how is fuel efficiency measured define the term

Answer 1

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.

Answer 2

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) .