What a great site! I bought a '99 Beetle at auction to save on gas and stop putting miles on my '99 Honda Odyssee. I'm just getting started trying to get better mileage.. I've already made a huge adjustment to the nut behind the wheel. I used to drive 75mph to and from work, and now I usually drive 60. every day I get less concerned about all the vehicles passing me and the looks I sometimes get.
I wish I'd done a little more homework before buying the Beetle. The stock Cd is 0.39!!! I've been looking around trying to figure out how to make it better and found a couple of good articles:
http://autospeed.com/cms/A_108675/article.html
http://www.evworld.com/article.cfm?storyid=911
I'm going to start with a roof spoiler and then move on to some kind of lower mounted wing. I'd like to build something like the wing in the second article, but the wife would have a fit!