I drove my 07 X3 nearly 3,000 mile (if I recall correctly) San Diego to Montana and around Montana for 3 days. I left SD two weeks after I picked up the car and it had maybe 1,000 miles on it when I left.

On the hiway on that trip it got about 23 MPG at that time around town in SD I think I was seeing 19 MPG.

Now I have 15,000 on it. I get about 24 MPG on longer trips on the road and 21 MPG or so around town.