Bill Jaeck, a retired health-care professional, and Jody Jaeck, a retired commercial artist, both 66 and living in Franksville, Wis., on their Volkswagen Beetle convertibles, as told to A.J. Baime.

Bill Jaeck: My history with VW goes back to the 1970s. During the energy crisis, I bought a Rabbit diesel and I remember getting over 40 miles per gallon. One day in 2000, I saw a 1978 Beetle convertible at a classic car dealership near my office. It was springtime and the weather was getting nice in Wisconsin. On a whim, I...