This web based CSS tweaker might come in handy
It’s been around since 2006 but I just found CSS Tweak, which might be a boon to those people who are looking to minimize the size of their site and therefore speed up the download process. See the results for DTM below:
However, I am not likely to ever get the best results unless I maintained two copies of the CSS. I love my whitespace too much! And I like comments. I tried it with the options of Leave my layout alone! chosen & remove comments unchecked and my net savings was a mere 1%! 