Recently I got suggestions in Google webmaster tool to improve PelFusion HTML. The issue was of duplicate title tags and meta descriptions, the reason was my pages were getting indexed twice. One was the normal permalink and other was RSS feed link. This issue can penalize your site in google because of duplicate content but you don’t have to worry as it can easily be solved by disabling it.
If you are using Feedburner feed, select your feed after logging in and hit the Publicize tab from top. There will be a Noindex option on left hand side, just check both boxes and activate it. This will stop your feed getting indexed by Google.
If you are offering feed directly from your site then you can use robots.txt file to block the feed url.