Irv Gordon fell in love in 1966. He bought a Volvo 1800S and was so enamored of it that he drove 1,500 miles in the first weekend and had to go back to the dealership the following Monday for its first service. Since then, the two have traveled 3 million miles together — the equivalent of 120 trips around the world, or six round-trip vacations to the moon. In 1998, Gordon set his first world record for the most miles driving by one person in a noncommercial vehicle when he reached....