President: William McKinley, Theodore Roosevelt
McKinley never owned a car, but we're including him in this because he was the first President to ever ride in a car. That car was a Stanley Steamer. Roosevelt was the first president to own a car, also a Stanley Steamer. Of course Roosevelt owned a steam car. Leno once quipped that steam cars are the only vehicles in which one "can get scalded and burned at the same time," sounds like something Roosevelt would like.