Fuel consumption is the amount of fuel used for a unit of distance. Gallons or liters per 100 kilometers (liter/100 km), gallons per 100 miles are normally
used in Europe to compare fuel consumption. The lower the value the vehicle has better gas mileage.
Fuel economy or efficiency is the distance traveled per unit of fuel (gas). Kilometers per liter, miles per gallon (mpg), miles per liter, km per gallons
are used in North America & UK for gas economy. The higher the value the car is more fuel efficient.