I would agree. You seem to know your stuff. And that's precisely the path I'm headed down. I'm going to pull the IAC this weekend to soak and clean it out in the event not enough bypass air is getting through during deceleration. I also picked up a fuel injector rebuild kit which includes the new o-rings, pintle cap and injector filter. So this weekend the rail is coming off. I've had it pressure tested at the rail and it's 50psi so that's about right.

Fuel mileage is decent. I get 19.2 combined. Last time I reset the consumption values was about 3 weeks ago and it's been about 50% city and 50% highway since. I've always found it to be very accurate after a few weeks of driving.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean