High consumption at the Honda Civic EJ9….

Hello! I have to get rid of something to my Honda Civic EJ9 again. EZ was 11.1997 and soon TÜV is fälliig. Quite exactly in April. I bought the good one only in January 2011. I find, however, that the fuel consumption is quite high by now. I read here in various threads of 6-8 liters, however, I come after my calculations to 10L/100km. Maybe I calculate wrong?! How do you check that so much on 100km was used up? So what is it going on? I do this so far so that we say exactly 20L tank, uind then drive until the yellow tank indicator lights up. I then drive still about 30-40km further and then look at the driven KM since the last tank filling. And if I go afterwards I have minimal 10liter consumption… what is quite a lot if I look at the other “consumption” threads. And with a look at the upcoming TÜV and another thread where someone has not got an AUeff. And by the way, the Extrason does not have a bad value.