I was in your same situation and i choose the fb.

I liked the comfort and stability of the fb, and the looks.
Not to say that the cerato is not stable though, just felt more refined in the fb.

If going for fb i would suggest you look for the facelifted fb3.

Personally i went for the 2.0 version. For the added torque over the 1.8.

Average fc under jam + city driving comes to 12.5km/l. But bear in mind this is based on the onboard consumption which tend to be abit inaccurate.