I know this thread is mostly related to the N20 owners but wanted to share what a N55 equipped X3 can do (also, I couldn't find a more generic MPG thread).
Got 29.2 mpg recently on a short (49 mile) country drive. This was over country roads with small towns every 10 miles or so. So there was a decent amount of stop and go along with a couple WOT passes on 2 lane country roads. Just normal driving. Pretty impressive when you consider the performance of the N55. While I've seen a few 30 mpg trips it's only over a short distance. I imagine with some hyper-miling techniques I could get 30+ mpg out of the N55.
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