High Fuel consumption on 1996 Mazda Protege

my mazda etude 1996 1.8se model has high fuel consumption pliz help me i am tired of buying parts but its not working i recently bought new injectors but it never changed a bit. its giving me 280km/40ltr its absolutely not normal. Pliz come to my rescue.

Asked by for the 1996 Mazda Protege
You are going in the wrong direction. There is nothing 'wrong' with the car. There are a few adjustments which need to be made and the problem can easily be eradicated. See my response on your previous post