Got 41mpg going round Scotland in the FRV two weeks ago, which it also manages at 75-80mph indicated on the motorway in summer too.
I think most medium-weight 4 cylinder modern EFi petrol cars will achieve similar mileages at similar ambient temperatures when cruising (until you use the performance on tap), unless there are other reasons to make them less efficient (open sunroof/windows, towing, stupid big wheels, etc).
At slower speeds the transmission will have a bigger effect on fuel consumption.
If you want much better than 40mpg you need a tinbox city car, or trick lean burn engines.
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