Eligible for H1B cap exempt?

My H1B petition was approved in 2007, which was valid till March 2010.

I travelled to USA in Feb 2008 and returned back in Aug 2010. Meanwhile I extended my H1B till March 2013.

Effectively, I have used about 2.5 years on my H1B. I now want to go back to USA, and want to understand if am eligible for a cap exempt.

Please advise.

U are Cap-Exempt till August 2016, which is 6 years from last day in US