I have no idea about the mpg values but I'm averaging 12.2l/100km since I got my m40i about 10 months ago. I drive a lot of very heavy city driving where I get on average 15l/100km.
I'm currently trying to have an experiment and see how much the different driving modes affect. So far it honeslty doesn't seem to make a huge difference. What does make a big difference though is how often you floor it.
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