GM is committed to create a Telsa rival. Just what Elon wanted. http://www.google.com/url?sa=t&rct=j&q=gm%20developing%20car%20to%20rival%20tesla&source=newssearch&cd=1&cad=rja&ved=0CCoQqQIoADAA&url=http%3A%2F%2Fonline.wsj.com%2Farticle%2FSB10001424127887323981304579079492902482638.html&ei=xoI3UpAGyoaMArfugMAJ&usg=AFQjCNGq1_9GJKaKeGdh__tf2hZKuaCTSA&bvm=bv.52164340,d.cGE Interesting comments from JB on battery cost: Tesla Chief Technical Officer JB Straubel says the company's battery costs are half or even a quarter of the price of the industry average, partly because of the company's strategy to use thousands of commodity battery casings rather than the specialized batteries that GM and Nissan use. "The battery prices in the Model S are substantially lower than what everyone expects today," he said in an interview. Mr. Straubel expects the energy density in Tesla's batteries will increase by more than 20% by the time Tesla's mass-market car comes out in about four years. More energy in batteries should equate to longer driving range for roughly the same price.