Did you try Kriss Feed ? Opensource, single php file, fast, no database needed, works great on mobiles, keyboard shortcuts, OPML import/export...

https://github.com/tontof/kriss_feed

Screenshots: http://sebsauvage.net/rhaa/images/201303/rha_20130317_kriss_... http://sebsauvage.net/rhaa/images/201303/rha_20130317_kriss_...

I love it.