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Just sort of guessing here, but maybe the downsides outweigh the potential upsides for putting the Cd out there. For starters, how do they do a standardize their Cd determination? If conservative with their methodology, you end up with an unflattering number for the Cd, if they are too aggressive with their methodology, then people can criticize them for having bogus numbers. Sounds like a no win situation to me. There are a lot of variables when coming up with a Cd, it isn't like you can just drop a car off a bridge and see how long it takes to hit the ground. Each wind tunnel has a ton of idiosyncrasies as wsll which would make it maddening to try and standardize numbers.
Also you have keep in mind that to the average person Cd really has no meaning.
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