First of all, let me welcome you to the ecomodder forum.
Our goals of improving fuel economy by changing our driving style(s) and aero modifications are only a little off from your goal of 200+ mph on the salt flats. We both are looking for vastly improved effieicency from the vehicles we have chosen to work with. We both want to use the least amount of horsepower for our targeted speed, because as the saying goes: "going fast costs money, how much do you want to spend."
Look at some of the aero mods here on the site and see what works for you. Road test the modifications and do share your results. Though our results may not seem as dramatic as yours (because of how fast each of us are going when we test the improvements), we may be able to learn from one another and IMHO that is why we exist.
