Hello one and all, I am a newbie to this forum and a new owner of a 05 Chrysler Crossfire Roadster n/a or,rather, my wife is. I am interested in knowing what improvements that can be made to the car to "effectively" improve the fuel economy . I am presently looking into a DCAI and possibly a different exhaust but am not interested in spending a lot of unnecessary $ on items that that are ineffective. Ideas please?