Why is Akio Toyoda offering prius version to GM <a href="http://www.boston.com/cars/news/articles/2009/06/30/toyota_may_offer_gm_a_prius_version/" rel="nofollow" target="_blank">http://www.boston.com/cars/news/articles/2009/06/30/toyota_may_offer_gm_a_prius_version/</a>