Don't most NPR listener's drive a Prius or Volvo?
Over the years I have heard questions about old Mercedes, but for the most part, and except for the folks here, the Mercedes owner demographic isn't much into radio diagnostics.
Years ago, a woman that I worked with got on the show. Her question was abou whether her husband should get a Jaguar XJ6 convertible. Tom and Ray said that he should get the 12 cylinder, in baby blue.