 For instance, it appears to compare different kind of roads in some publications as it had been computed on a fiver years period between 1995 and 2000.In the United States, it is computed per 100 million miles traveled, while internationally it is computed in 100 million or 1 billion kilometers traveled.According to the Minnesota Department of Public Safety, Office of Traffic Safety
Energy efficiency in transport can be measured in L/100 km or miles per gallon (mpg).