Hi Mick
Had my 2016 2 ltr X3 Auto for 4 weeks now, bought from main dealer and done some 1600 miles of all sorts.
So, using Cruise control and ECO as much as possible finding:-
Town 25 MPG
Country, Cornwall, up and down hills and tractors 35 to 40 MPG
Motorway Plymouth - B,ham return 50.1 MPG.
Thought to be as high mpg as possible.
So.. very Happy!!
BUT, Speed kept below 64 mph And av speed PLy - B,ham 52 MPH
Biggest factor in econmy...right foot!!
Hope this helps
Phil