Here’s a video from a few years ago about Plymouth Prowler fans driving the Mother Road:
WJRT-TV, which produced the video, is based in Flint, Mich. I’m not sure when this aired; the station has nothing about it in its website archives.
According to Wikipedia, production stopped on the Prowler after the 2002 model. And John Mayer’s version of “Route 66” was released with the “Cars” movie soundtrack in 2006.
I was fortunate to meet The Prowlers in Amarillo & at the Midpoint Cafe, wrote an article about them for The Route 66 Pulse newspaper. Great bunch of folks & cool cars, still keep in touch with a fw of them, they will be back on 66 in 2013.