MPG experiment....1976 Dart Lite

I just read the entire thread (great thread)... the only thing I can see that hasn't yet been mentioned is your wheels. I would recommend that you try to upgrade your wheels to something more light weight (i.e. aluminum mags). Those old steel wheels are heavy, and considering they're rotating mass the extra weight is that much worse. A light weight drive shaft would also help, and maybe some lighter drive pulleys (if you can even get them for a slant).