I love your diesel Beetle ! lots of Honda owners on this site who are getting amazing mpg. The vw diesels are also getting amazing mpg, both your cars are in or nearly in the top 10 high mpg vehicles list. Welcome to the site.
http://ecomodder.com/forum/bestgasmileage.php
some tips i like to read over from time to time
http://ecomodder.com/forum/fuel-econ...ifications.php