DNG vrs Raw

I have read a dng file is about 20% smaller than a normal CR2 or raw file.  I am thinking of using dng however is there any loss of data or information when converting to dng when importing into LightRoom?
Also in Photoshop CS5 you can use the preference link at the bottom of the Camera screen to set a file size larger than the native size of the image from the camera.  Is there a way to do this also in Lightroom?
Thanks for any help
Tim

I used to be a huge beleiver and advocate for DNG because of the uniformity of files and getting rid of .xmp's. However, I don't convert to DNG anymore. Lightroom simply takes too long to convert on import and when you have 100s of photos every day it adds up.
I also found that my files were actually bigger, not smaller. Don't know why, maybe because i shoot mostly in sRAW on my 5DMkII? Then when LR3 was first released it tended to corrupt the files so that was the point I ditched it and never went back.
As for image quality, I never saw any difference between CR2 and DNG.

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