WASHINGTON - MARCH 14:  (L-R), Rex Tillerson Chairman and Chief Executive Officer, Exxon Mobil Corp., James Mulva Chairman and Chief Executive Officer, Conoco Phillips, David O'Reilly Chairman and Chief Executive Officer, Chevron Corp., Bill Klesse Chief Executive Officer, Valero Energy Corp.,John Hofmeister President, Shell Oil Company and Ross Pillari President and Chief Executive Officer, BP America, Inc. appear before a Senate Judiciary Committee hearing on Capitol Hill March 14, 2006 in Washington, DC. The committee is listening to testimony on consolidation in the oil and gas Industry and rising fuel prices.  (Photo by Mark Wilson/Getty Images)