There is so much information on MPPK here if you are willing to take the time and research.. most of your questions can be answered by reading this thread
http://f15.bimmerpost.com/forums/sho....php?t=1157810
I've done a review on it here
http://f15.bimmerpost.com/forums/sho....php?t=1170172
Which, I also include the pdf file that answers your questions regarding fuel consumption. According to BMW
Quote:
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Comparable consumption despite higher performance. Fuel consumption and emissions levels in the ECE driving cycle correspond to those of the series engine, even though the M Performance Power Kit boosts the engine's performance by an additional 6.66%.
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For me personally, I don't pay attention to fuel consumption but I fill up every two weeks just as I did prior to getting the MPPK tune installed. So in my experience consumption is negligible.