http://www.edmunds.com/insideline/do/Features/articleId=107485?flushCache=true
How has Gran Turismo improved over the years? Obviously the graphics are stronger, but what else do you feel has really improved with each version of the game?
We've really split the games into two generations. The first three games were from the first generation, but with Gran Turismo 4, and going forward, we're into the second generation. So, if you do something like drive the cars in real life after driving them in the game, only in Gran Turismo 4 will the accuracy truly feel like real life.