Only 4 stars because of price and cover

In advertising, it is claimed that the use of this agent reduces fuel consumption, but I could hear no visible difference.
It may be that it is fuel savings of 3 or 4km, then LM has at least not lying :)
Let's see from them the price is still high in law, that one sees nothing of any improvements. Even if one fills up quite cheap (1.56 / l) increases this if you are to this agent.
Another point of criticism would be the cover of the product which you should use as a measuring cup to the correct amount of additive to pour in the tank.
And there lies the problem: The measuring cup is too short as one can enter the liquid in the measuring cup point or spillage into the tank. Since a funnel would be recommended for filling!
From the ride I can only say that the car less "shaking", that is quiet running (Mazda Demio 2000).

So if you do not expect too much as a quiet running engine can probably safely access my opinion here.

Greeting