Couldn’t driving more be a sign of a strong and productive economy? Other large countries like Russia or Australia or something that drive less have smaller GFP as well.

Can we make a better comparison of how much Americans drive, plus total travel, vs total travel for other countries of similar density and size?

I imagine you'd have to weigh this against alternative forms of transit. The freight rail industry is the largest in the world and directly represents (presumably productive) economic activity. Personal transit makes up a much larger percentage of road usage, even in metro areas with healthy public transit. It's hard not to see this as some form of inefficiency.