Bone stock, here is my reply to a previous poster asking a similar question. "I have been a bike commuter for roughly 40 years and an avid cyclist for much of that time. In my experience, anything you do to a diamond frame bicycle will have minimal effect on your commute times. I commute year round wearing bulky, baggy clothes in winter. The biggest drag comes from the rider. If you can get your upper body low and your back level with the ground that will make the biggest difference. You will decrease your CdA so a drop bar may be better than a flat handlebar. An "aero-bar" may get you even flatter but it is not practical to ride that way in traffic.
Anything you add to the bike may help in some ideal conditions but be a hindrance in everyday use." There is someone who made a coroplast bicycle fairing that he claimed helped. I will try to find the link. You may find some interesting reading on this topic using the search function on this site.
http://ecomodder.com/forum/showthrea...ike-31669.html
