Kaz said he was able to drive the Nur much easier after playing GT4:
"-You've recently been to Nurburgring.
Yes, I had a multitude of reasons for going, one being to promote GT4 in the European market, as well as to actually drive the course. I practiced driving the Nurburging with GT4, nearly 800 laps, before I actually drove in real life. Amazingly, I could drive the course easily the first time with the practice from GT4. (laughs)"
"-What car did you use?
An Audi TT Coupe. On one lap I had a Nissan test driver Gato-san in the passenger seat. He was amazed at my driving the ring, said that "this was not possible". He was a man who drove GT-R's for 15 years at the ring and was amazed at my driving the course with such skill the first time. This was a testament to the reality of virtual training, even in a small windy course such as nurburgring. The staff, as well as myself were incredibly amazed."
800 laps in the game.