Full tank indicator

[island_Vitz]

Thanks for the replies.
I've been using Fuel Buddy app to record and calculate fuel efficiency instead of doing it manually. I'll do it manually as well and compare results. I'll also try my best to fill up at the same station and pump. I have heard before that different pumps can have different sensitivity.
I'm scared of filling to the brim as once with my VW my fuel tank started leaking right after filling to the brim. Maybe there's no connection but I'm scared.