| Ronald Muhlenkamp Buys AMR Corp., Dollar Thrifty Automotive ... - GuruFocus.com - in www.gurufocus.com - Ronald Muhlenkamp Buys AMR Corp., Dollar Thrifty Automotive ... GuruFocus.com, TX - ... His sale prices were between $27.6 and $30.11, with an estimated average price of $29. The impact to his portfolio due to this sale was 3.35%. ... |