Oprah Winfrey gave away 276 Pontiac G6 cars to her studio audience. The cars were donated by Pontiac, which coughed up over $7 million but got a huge advertising bang for its buck since the story made headlines around the country (and is on the cover of the upcoming People magazine). According to comScore Networks visits to oprah.com jumped 800% from Monday to Tuesday as over 600,000 people logged on after seeing Oprah. Visitation to pontiac.com jumped 600% in the same period as over 140,000 people viewed the site, the company noted.