Fuel efficiencyFuel efficiency, sometimes also referred to as fuel economy, is a numeric measure often used to describe the amount of fuel consumed with regard to the distance travelled in a transportation vehicle, such as an automobile.
The measure is usually expressed in two ways:
- As the amount of fuel used per unit distance; for example, litres per 100 kilometres (l/100 km). In this case, the lower the value the more efficient a vehicle is;
- As the distance travelled per unit volume of fuel used; for example, kilometres per litre (/b>) or miles per gallon (mpg). In this case, the higher the value the more efficient a vehicle is.
To convert x l/100 km to y mpg, perform:
- 235.2146 ÷ x l/100 km = y mpg (US liquid gallon), or
- 282.481 ÷ x l/100 km = y mpg (Imperial gallon)
- 235.2146 ÷ a mpg (US liquid gallon) = b l/100 km, or
- 282.481 ÷ a mpg (Imperial gallon) = b l/100 km
- 2.352146 * m km/l = n mpg (US liquid gallon), or
- 2.82481 * m km/l = n mpg (Imperial gallon)