Yes, minimizing HTML, CSS and JavaScript, removing spaces, tabs, newlines and comments, saves bandwidth costs.
In addition, to minimize HTML, you must also be sure that your HTML, CSS and JavaScript are GZIP'ed when they are sent over the cable for better performance. For more information about GZIP, read: http://developer.yahoo.com/performance/rules.html#gzip
I would also like to add that it is very important to think about the cost of bandwidth and page speed to any extent on this day by age. Mobile website users are booming up. Even if you do not expect a big mobile draw from your site, you are making choices to those who are trying to access your site on their 3G mobile devices without taking proper considerations of cost and bandwidth.
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