...
I didn't just look at the files ..
I played the game and played with the files ...
since you mention the Le Mans race
you see the longest straight line ?
well at some point I took the turn just before in a way that I had more speed when exiting from the turn, which allowed me to get past 2 AIs with same vehicle as me on the first couple of seconds of the straight line ...
then I continued and got farther and farther...
yet a bit before the end of that straight line (well before you need to brake) the AI caught up with me at full speed which is just outright impossible..
this is AI cheating and he got no less than a 20% boost...
I'm not against a bit of a draft and this is normal behavior but for real life draft to kick in, you need to be pretty close
http://en.wikipedia.org/wiki/Drafting_%28aerodynamics%29
end of story!
sidenote: the car used was GT1 or GT2 class, don't remember, again the AI had the same car, and the car I bought was not an "ebay" car (so, not influenced by "ebay modifiers")