Well I have had my 2013 x3 28i since Aug 14 and I just leave it in Comfort with the occasional Sport but for the most part I'm getting 21 mpg. I did about 1500 miles on the highway and about 400 miles in town. I was definitely getting about 28 on the highway sometimes even more but I drive really aggressively in town and I get maybe 15 mpg or less. It should increase after you add the miles on it.
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