A little bit off topic, but a mate of mine with a common rail 3.0 Patrol with a snorkel has turned his snorkel head around and is managing to get better fuel consumption. Apparently something to do with the computer not liking the ram air effect that the snorkel produces. Maybe food for thought for those with CRD engines.
By the way my 1fz does not have have a snorkel but the balance tube in question was fitted when the LPG was installed as a part of the standard LPG install.
Hillbilly