The agency researched which premiums might "incentivize" test drives; we arrived at these 3 premiums/creative hooks:

Road Atlas: "Test drive the Nissan Altima. See the United States, Canada and Mexico."
Car Vacuum Cleaner: "Test drive the Nissan Altima. We'll send you off a little cleaner."
Music CDs: "Listen to the gift you'll receive when you test drive the Nissan Altima."