How does ACR compute focus distance?

Hello folks,
In the recent versions of ACR, I've seen that it can include in the EXIF the focus distance from converted RAW files. I'm just wondering how it determines such information, particularly with Canon CR2 files. The focus distance seems to be accurate only on very long focal lengths (500mm and above). I have a 400mm lens and I noticed that I'm getting only any of 6.5m, 11.5m, or 76.6m as focus/subject distance.
Can you guys provide me an idea as to how the the focus/subject distance is determined? For the type of photography that I do, this would be a very useful piece of information.
Thank you very much.
Mark

Thanks, guys!
@Jim:
I'm using a Canon 40D . Indeed some of the focus points are on areas which might be farther than the subject, but they were not activated (since I used only the center point AF). I believe embedded focus distance should be based only on the active focus point/s.
@ssprengel:
Yes, it seems there is a predefined set of distances that are returned.
Thanks for the link. I tried it and I'm still trying to figure out how the focus distance is determined based on the metadata (that was an awful lot!) retrieved. Of interest are the fields FocusDistanceUpper and FocusDistanceLower, but I couldn't find documentation about these fields in the web. The tool will be very useful. When I have the free time I can probably conduct some tests.
@MadManChan2000
Does it mean the camera embeds a rather rough approximation of this information?

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