I definitely saw prefect draft pop up on screen when I was running one of the career races. I have not looked at the stats to see what it says there.
I have noticed that the perfect turn does not seem to work on the Indy oval in 7. In 6 I generally get anywhere from 2 to 4 perfect corners every lap on that track. Did a 25 lap race on 7 nailing every corner on many laps and not even one perfect corner registered. I even intentionally altered my normal racing line and turned on the full line, followed it around the corners and nothing not only did I not see a single perfect turn but did not even see a good turn the entire race.
The only reason I noticed the perfect turn thing there is that I equipped a mod that pays off for multiple perfect turns thinking that would be easy for me on that track and not even 1 registered.
Edit: Looking at my stats I also show 0 perfect drafts but I definitely saw it say Perfect Draft at least once during the Nascar career races.
I also see that it shows for Indy oval out of 13 races I have 7 perfect corners so that is on average 1 per every two races when if it was working properly should be closer to 2 per lap if not more.