I was suprised when the low oil light recently came on in my 1.4 petrol. I haven't had the car that long and it was serviced when I bought it. I thought maybe they didn't put enough oil in as the dipstick is so hard to read, but it is beginning to sound that this is perhaps normal. Mine is a bit tappety too, although the noise goes away when it warms up - it's just unfortunate that it echoes around the underground carpark in the mornings. Otherwise it is smooth and pulls well also.
My old Leon Cupra had a similar thirst for oil. I had it checked out but no one could find anything wrong with it. At least the Leon had a regular dipstick though, the one in the A2 makes it difficult to judge how much to top up with.