The Berlingo is a very popular van , plenty of load space,and will do around 50mpg( so Im told by an owner)..
I cant see us getting that good a return, given the nature of the business, stop start and short journeys.
All the same though, they have loads of storage space, the passenger seat base lifts up to allow for storage, It would be too small for me, the down side of it is the driving compartment, again too small, even with seat right back and wheel at the highest setting, my 6ft plus frame wouldnt fit comfortably, knees still touching bottom of steering wheel.