Same as me then. My mileage was going to be around 20-25k a year but then due to a position change at work (promotion), it's dropped massively to around 9-10k per year. If I'd have known that at the time of ordering last year, I would have most certainly been driving a GTI and not my GTD right now, and to hell with the added fuel costs for such a small mileage.
Ah well, such is life. It's not like the GTD imposes massive penalties on me over a GTI (just a little bit slower, a little more noisy and not "quite" as sharp), but overall it's still a cracking car, and for me is averaging approx. 45mpg and that's just to and from work (around 8-9 miles each way), with nearly 60mpg on a run. I know the GTI would be about 10-15mpg down but that's still not bad for a 220-230ps hot hatch !