FRANKFURT AM MAIN, GERMANY - SEPTEMBER 15: German carmaker BMW's CEO Norbert Reithofer presents BMW's 'Efficient Dynamics' fleet  at the international motor show IAA on September 15, 2009 in Frankfurt am Main, Germany. The world's biggest auto show runs until September 27. Getty Images logo Getty Images 2 months ago

FRANKFURT AM MAIN, GERMANY - SEPTEMBER 15: German carmaker BMW's CEO Norbert Reithofer presents BMW's 'Efficient Dynamics' fleet at the international motor show IAA on September 15, 2009 in Frankfurt am Main, Germany. The world's biggest auto show runs until September 27.