OK guys, thanks for the replies.
I was just wondering because on Friday i went out for my lunch to the nearest filth wagon for an egg, sausage and grease butty - noticed on the meter i had about 8 miles of petrol left so thought nothing of it.
I go back to work and park up ( on a forward tilting incline i might add ) and noticed that upon restarting the engine at 5pm that suddenly ive got 0 miles of petrol left!!
Was a bit of a brown trouser moment trying to get to the services petrol station! Which was over a mile away too.
Adam