Having similar issues with my wifes E91 320i Auto. Only gets 26-27 mpg in normal dricing and just over 30 mpg on a steady motorway run. Previously on her normal commute, she would easily get 33mpg in a Merc C180K auto. Been into the stealers 4 times and all they do is run diagnostics and come back with "computer says no". They have tried a couple of things such as resets and uploading latest software but no change. I cleaned the MAF today and had a drive around. It did seem to be more responsive low down as it was previously very sluggish but too early to say if it's helping the economy.
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