Glad to join the community. I drive a lot on my daily commute and in general, and am happy to see other people care deeply about driving habits and fuel economy.
On a side note - this may not be the appropriate place to post, but is there a function to track monthly fuel costs or price/month or a similar metric? I didn't see it in the custom stats section or any mention of it after running a quick search through these forums.
You could extrapolate this from your logs but there isn't simple function to do this. There are average costs available as well. As an example I see that you spent $217.80 last month http://www.fuelly.com/driver/dashazi/328i
You could change the parameters of this option to pull info from a longer period