[spoolinX1]

I personally do a lot of city driving, so the ECO PRO option does not do much for me, if anything. I save maybe ~5-10 miles per tank by leaving it on. The Start/Stop function is useless to me here based on the amount of "Rolling" stops everyone does here in my area. I've found that, due to local traffic patterns, I often have to brake hard and accelerate hard in order to mesh with other vehicles. There's nothing economical about New York driving.

I've only owned the vehicle for a couple months, but to contribute to your post, here are some concrete numbers that I've obtained from my first 5 Fill-ups. I track this stuff religiously.

2014 X1 28i (AWD) I pretty much drive like a grandma. I do not have any engine modifications (At this time)

Total Miles per Tank of Gas (Miles Actually Traveled plus Miles Remaining on dash)
Fill-Up 1: 362
Fill-Up 2: 371
Fill-Up 3: 381
Fill-Up 4: 372
Fill-Up 5: 364
Average : 370 Miles Traveled per tank of fuel

Miles Traveled per Gallon
Fill-Up 1: 22.63
Fill-Up 2: 23.76
Fill-Up 3: 24.41
Fill-Up 4: 25.14
Fill-Up 5: 24.82
Average: 24.15 MPG

Gallons required at Fill-up
Fill-Up 1: 16.00
Fill-Up 2: 15.62
Fill-Up 3: 15.61
Fill-Up 4: 14.80
Fill-Up 5: 14.67
Average: 15.34 gallons required per fill-up

Hope this info helps.

An extra piece of info, if it helps anyone. I live roughly 7 miles from my work. I work 5 days a week. I do not drive a ton aside from going to work, but I do go shopping a couple times a week, play sports three nights a week, go to dinner a couple nights a week. Here is how many days I go between refueling:
Fill-Up 1: N/A (Car was new to me)
Fill-Up 2: 17 days
Fill-Up 3: 14 days
Fill-Up 4: 19 days
Fill-Up 5: 17 days
Average: 16.75 days traveled between fill-ups