About 13.5 in city driving. As it gets colder, that can drop as low as 12. Plan on about 2MPG better with the 35i. Nothing huge.
BTW, highway normally around 22MPG with my 50i.
Our Clubman S gets 29MPG in the city however.
2017 M2, LBB 6sp w/exec
2011 1M, Black loaded sans sat radio