Very little. I have a full UK driving licence, and my own car. However you probably interested in performance driving and really that is only one karting race. It was a few months before GT5 got released. Anyway this is the event I did and my older brother also went:
http://www.buckmore.co.uk/content.php/32520
My older brother has more experience driving cars than me. Cars ranging from Clio 172’s, 3 Series M Sport, S class and he recently experienced driving the SLS AMG. Shame I never got picked for that SLS AMG competition, otherwise I could have potentially beaten David Coulthard in the live race. My brother, really the most experience he has had in GT5 is when he did the laps on the GT5 racing pods there but back in the day he was a Super Mario Kart expert.
Anyway back to the karting race, my target was to beat my brother, he thought I’d lose as I had not even had a driving licence then and last time I drove any car was about 9 months ago, was away at Uni. Anyway, he qualified in front of me by about 1.8 seconds, I qualified near the back 33 out of 35. Spent a lot of time looking back as most where experienced, I think we even had a pro karter in the race. Anyway within a few laps I did a time that is like over 4 seconds quicker than my qualifying time which is not bad but then next lap span testing the brakes (Interestingly braking in karts is also a problem I find I have in GT5). Then I thought it was not a good idea to push as there are quite a lot of karts going round and I didn’t want to get hit and I knew I had already overtaken my brother. Anyway I finished 7 places ahead of my brother. He struggled to look behind and move out the way for faster drivers so crashed a few times. I think my GT5P driving experience helped here, as being used to driving things like the F2007 in the game, I could be aware of everyone around me and look back when going at the highest speed you can go on that track with that specific kart, no problem (About 49Mph). Near the end I lapped him, and could see why people crashed into him, he was not even looking at me when I was side by side and would have run me of the track if I had not backed out. Overtook him when he made a mistake shortly afterwards.
Back to the main point, I’m quite young still, only 20, and really without being involved in the motor industry or being some form of racing driver it is unlikely I will experience things I mention in games unless I go on them experience day things. I plan on actually doing a proper one of them experience day things in the near future. There are probably some top karters who haven’t experienced the things I mentioned in the games as really you need to be involved in road cars. The last person you replied to on this thread had a racing license and you disagreed with him so don’t go out and say, unless I’ve done this and that for real, my experience in the games I’ve played means pretty much nothing.
I’m not though am I, just saying my recent experience and will be interesting to see how it compares to the full game. I am not saying it as a fact.