high fuel consumption - ibiza fr 2005

[AviTurbo]

hi i've just bought the car and i notice a high fuel consumption the car have 53K with no remap or any change.

since the last owner never change the spark plugs i took the car to my mechanic yesterday and he checked the car with a scanner , he told me all the sensors (maf , COILS ) are fine
but there is a miss fire in cylynder no 1

so i ordered those ngk pfr6q spark plugs from ebay

with a big hope this will solve the problem, what do you think?
i check KM/LITERS and the car drinks 7km to liter

 

[kriso]

It's probably a coil pack that needs to be replaced too.

 

[AviTurbo]

old spark plugs have effect on fuel cunsumption?

i'll try my luck first with spark plugs and if it won't work i'll have no choice