ive been getting around the same figures as chylld with a 06 civic VTi on normal unleaded petrol. ive tried optimax and that had no improvement so i stopped using it. on roads where i barely stop(eg. freeway) i can get over 400km's easily, but as soon as i hit the normal roads.. lol, my petrol consumption just dies.
i also had the same petrol pump problems, and i also did what chylld did lol.