This measure of efficiency is an example of mileage. Mileage is a term used to refer to the total distance covered (in miles) per unit volume of the gasoline. People would likely opt to buy cars or any vehicles with higher mileage in order to save up the gasoline use.
MPG. Miles Per Gallon is used in the U.S. to measure the efficiency of gasoline used in cars. Other places in the world, such as the U.K. and other European and Asian countries used KPL, or Kilometers Per Liter.
It is an example of fuel efficiency. This is a converting process of chemical potential energy into kinetic energy or work. It is also a measure of average distance that travels per unit of energy and is used to compare the consumption of energy from other vehicles.