[expatpat]

A couple of comments.
1. The soot filters may take out 95% of the mass of the soot, but they don't do well on the tiniest particles, which are the ones that cause the most breathing problems.
2. The turbochargers are additional cost and reduce engine reliability by quite a lot.

[JAKraig]

I’m working on my third hundred thousand miles on my 97 VW Passat. I still get nearly 45 mpg. I’ve never had to replace the turbo. I can afford any car I want, I take frequent 1000 mile trips. I love the milage. When they come out with something better I will buy it.