Regarding fuel mileage -

Here is my best tank, copied from an earlier thread that got hijacked.

665 miles
avg speed - 68.4
30.5 mpg on the OBC, 30 on the dot by my calculations.

Still had 30 or so miles till empty but didnt want to push it not knowing the area. Hoped to get 700 and send a picture to BMW. Probably could have done it if I had gone a little slower.