I have a plain old gas powered 2001 Hyundai Elantra (stick). Ive been drafting what I would term semi-close, (probably 70ft or so) on a drive thats highway(55-70) speed the whole way. I went from about 32-34MPG, to 38. Definitely works. Mythbusters tested the drafting myth and confirmed it. They gained about 40% at 10ft (very dangerous!).