Why does my number of litres per 100km drop everyday

What is your question?

I bought my Ford edge 2009 SEL a month or so ago with no issues. I've since noticed that the censor display has gone from 13.2 litres per 100km to 11.5 litres per 100km. each journey it drops slightly. Why is this? Is it the fuel I'm using?

What makes this problem better or worse?

Nothing

How long has your 2009 Ford Edge had this problem?

1 month