Make sure you read the owners manual on how to properly check the oil. On the GTI, you're supposed to check the oil level at operating temperature. May sound funny, but the ole' rule of thumb is check it when it is cold, but VW has determined the length of the dip stick to read accurately when hot.
Truth be told I checked the oil level and it didn't look low but my natural reaction was just to top it up a bit and then the light went off. So I haven't particularly paid that much attention.
On a modern engine I'd perhaps expect a little usage whilst everything is bedding in, but after that the consumption should be minimal.