xDrive 28i here, on my last tank I drove 425 miles and filled with 15.25 gallons (75% highway/25% city).
My overall average in 14000 miles based on computer is 25.0 mpg.
If you want to get high mileage drive at about 65 on highway. X1 has more drag than a sedan (more ground clearance and taller body) so the mileage drops once you go faster.
PS eco drive wont don much on highway. It should improve the mileage in stop and go traffic.
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