Hex, OBD-II tools cannot properly read fuel economy in lean burn. We discuss using bluetooth dongles, Android aps, and prepaid phones here:
http://ecomodder.com/forum/showthrea...0-a-30169.html
However, if you want accurate MPG information, you need an
MPGuino - EcoModder.
Freebeard, I am afraid that I am far more prolific than profound. Sorry.