Just shy of 4,000 miles and for the last 1,000 or so the actual mpg has risen to 27.6 overall with the 28i xDrive using 91/93 octane and using eco-pro and ASS. By comparison our X3 35i MSport (without eco-pro or ASS) is at 18,000 miles and has been returning 25.6 mpg. Same 2 drivers on mostly highway miles. Happy enough with the X1 and extremely happy with the X3.
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