I've just gone over 1,000 miles.
My (irregular) commute is 95 odd miles, mostly Motorway with some Urban & A Roads at either end.
The last two journeys along the same route returned 41mpg (Friday evening - 2hr15mins in heavy traffic) and 35mpg (Sunday evening - 1hr35mins in very light traffic).
Both journeys in Normal mode, mostly in Drive, some in Manual

Based on the above I'd say 45mpg is possible once the car is run in (10,000 plus), at steady speed on a reasonable run.