This unforgetaable (to me) ad came up in a conversation today, IIRC, it's from the 1970s. Can you fill in the spaces?
You see a green mountain scene, with a grassy slope going away from you, and a small patch of black road at the bottom. There is the sound of someone going up and down through the gears. Suddenly, a red sport sedan (coupe>) comes into view on the road and the voice -over says, "Every ________ leaving the ______ factory rides of _____________tires". as a man exits the passenger (far) side of the car. "Why? Because ________________."
{Not a trick question,)