Thanks Chris, that's interesting info. I really expected the Jetta to be better than the Golf. Oh well. I wonder if the Jetta GLI 16V rear spoiler would help?

On the issue of the Scirocco 16V urethane/foam stuff, I've heard that it was more for looks than anything else. Someone knowledgeable told me that he thought it would increase drag over the cleaner 8V trim. Either way, it's hard to say what happens in IT trim with the windows down, etc.