That write up does not apply to you. The idle control valve on the M44 is right on the front of the throttle body. You only need to remove a couple of Torx bolts and unplug the harness connector to remove it. This is the thread you want for that:
http://www.318ti.org/forum/showthread.php?t=27697 How old are your o2 sensors? They can be worn out enough to cause mpg problems without turning on the check engine light. You can also change the oils in the transmission and differential to some nice synthetics and see gains, depending on what's in there.