Tesla Motor Inc (NASDAQ: TSLA) has been the stock to buy with its electric cars preparing to hit the market. Investors have been throwing there money at the company and being rewarded for it, the company stock price has went up 4x since the start of the year. Tesla is currently trading at $143.25 a share compare to $26.86 a year ago. So why is Warren Buffett investing in General Motors Company (NYSE: GM) instead?? Buffet of Berkshire Hathaway Inc (NYSE: BRK-A) has increaed his share in General Motors. He used to own 25 million shares of the motor company, now he owns 40 million basically 29% of the company. Does Buffet know something we dont?