Fuel economy is the distance travelled per unit volume of fuel used; for example, kilometers per litre (km/L) or miles per gallon (MPG), where 1 MPG (imperial) ≈ 0.354006 km/L. In this case, the higher the value, the more economical a vehicle is (the more distance it can travel with a certain volume of fuel).
Mpg in fuel consumption units: mpg = Miles per Gallon mpg = miles / gal putting kilometers equivalent in mpg equation mpg = 1.609344 km / gal putting litres equivalent in mpg equation mpg = 1.609344 km / 3.78541178 l now we get the mpg to km/l conversion factor = 1.609344 km / 3.78541178 l = 0.425143707 km/l mpg = 0.425143707 km/l.