A more efficient car will have smaller LPK number.
Step-by-step explanation
LPK number is the measure of liters of fuel consumed by the vehicle to travel one kilometer distance.
The LPK number that is liters per kilometer number is used in Europe to determine the efficiency of cars.
A car will be termed as efficient if it uses less amount of fuel for travelling a larger distance.
This indicates that car which has more mileage or in other word which consumes less quantity of fuel to travel longer distance is termed as efficient cars.
Thus , a more efficient car will have smaller LPK number.