i think that may be in part true because most h-bodies still had relatively big V6 engines - because its only data about the # of them 'registered' ..gas was still up back then and almost no-one drove anything as big as 3.8's V6's ..
https://www.hagerty.ca/articles-videos/ ... inct-cars/
hagerty-lists-top-threatened-endangered-and-extinct-cars
do you have any data on this marco ?
are we rare yet?