Gran Turismo has sold 5.5 million in it first 13 days averaging 423,000 copies sold per day as of December 6th.
Gran Truismo has sold now 61 million overall and is the highest selling exclusive PS series.
http://www.gtplanet.net/5-5-million-copies-of-gt5-sold-series-tops-60-million/
This is very good sales and VG Chartz is way under tracking it.