Good morning, I hope I can help you.
Replacing the fuel filter should have no bearing on the fuel consumption of the engine if there is no leak present.
That means either it isn't using more fuel or if it is then there is something else causing it.
The best thing to do is put it on a suitable scanner to check all the sensors are ok and also carry out an emissions test.
This should highlight any problems.
My name is Bill and if you need further help, just ask.
UK Car Mechanic
City & Guilds