Then it is engine vibrations or some other variable they are not mesuring properly and not applying to their game mechanics.  It's a pretty noticeable and somewhat disruptive difference between the two.

A simulation, in this case, ends up coming off looking too "clean" compared to real life.  The fade, and other imperfections are what make the real life stand out more real.  Of course, being more "fake" looking can help make a game better to play actually.

And, connected to the "uncanny valley" issue, I believe the closer you get to real, the more the lack of the "imperfections" cause the simulation to stand out as more fake.

I think some of you guys are reading waaay too much into the video. Can't we all just agree that GT5 will be one of the best sim. racers of all time-that is till GT6 arrives :p 

*note* GT6 probably will not be out till later this gen or next, so I'm assuming a good 2 years if its a speedy sequel to 5-6 if its meant for the PS4. I'm going with the former.