PUZZLE 053 Tireless Truck

This gentleman wants to drive his car to the neighbouring town.
There's a lorry travelling there at the same time, which can transport even the heaviest and largest of items.
If the man puts all of his luggage in his car, he will need fifty litres of fuel.
The fuel consumption goes down by one litre fore each ten per cent of the luggage not packed in the car.
What is the minimum amount of fuel the man's car will need?

Hint 1

The key here is how to make best use of the lorry.

Hint 2

The lorry can be a big help.
You should let it take all of the luggage.

Hint 3

Is there any way the car driver could sit back and relax on their way to the next town?

Super Hint

Why not load the car itself onto the lorry and have it transported to the next town?

Answer for 'Tireless Truck'

The answer is '0'.